docs(exercises): updated all exercises readme files

all exercises readme files now have a unified structure and a description
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### Clippy
# Clippy
The Clippy tool is a collection of lints to analyze your code so you can catch common mistakes and improve your Rust code.
If you used the installation script for Rustlings, Clippy should be already installed.
If not you can install it manually via `rustup component add clippy`.
For more information about Clippy lints, please see [their documentation page](https://rust-lang.github.io/rust-clippy/master/).
## Further information
- [GitHub Repository](https://github.com/rust-lang/rust-clippy).

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### Collections
# Collections
Rusts standard library includes a number of very useful data
structures called collections. Most other data types represent one
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You may also know this by the names [*unordered map* in C++](https://en.cppreference.com/w/cpp/container/unordered_map),
[*dictionary* in Python](https://docs.python.org/3/tutorial/datastructures.html#dictionaries) or an *associative array* in other languages.
[Rust book chapter](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)
## Further information
- [Storing Lists of Values with Vectors](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)

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### Type conversions
# Type conversions
Rust offers a multitude of ways to convert a value of a given type into another type.
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These should be the main ways ***within the standard library*** to convert data into your desired types.
#### Book Sections
## Further information
These are not directly covered in the book, but the standard library has great documentation for [conversions here](https://doc.rust-lang.org/std/convert/index.html). The `FromStr` trait is also covered [here](https://doc.rust-lang.org/std/str/trait.FromStr.html).
These are not directly covered in the book, but the standard library has a great documentation for it.
- [conversions](https://doc.rust-lang.org/std/convert/index.html)
- [`FromStr` trait](https://doc.rust-lang.org/std/str/trait.FromStr.html)

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### Enums
# Enums
Rust allows you to define types called "enums" which enumerate possible values.
Enums are a feature in many languages, but their capabilities differ in each language. Rusts enums are most similar to algebraic data types in functional languages, such as F#, OCaml, and Haskell.
Useful in combination with enums is Rust's "pattern matching" facility, which makes it easy to run different code for different values of an enumeration.
#### Book Sections
## Further information
- [Enums](https://doc.rust-lang.org/book/ch06-00-enums.html)
- [Pattern syntax](https://doc.rust-lang.org/book/ch18-03-pattern-syntax.html)

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For this exercise check out the sections:
# Error handling
Most errors arent serious enough to require the program to stop entirely.
Sometimes, when a function fails, its for a reason that you can easily interpret and respond to.
For example, if you try to open a file and that operation fails because the file doesnt exist, you might want to create the file instead of terminating the process.
## Further information
- [Error Handling](https://doc.rust-lang.org/book/ch09-02-recoverable-errors-with-result.html)
- [Generics](https://doc.rust-lang.org/book/ch10-01-syntax.html)
of the Rust Book.
or alternatively, check out the sections:
- [Result](https://doc.rust-lang.org/rust-by-example/error/result.html)
- [Boxing errors](https://doc.rust-lang.org/rust-by-example/error/multiple_error_types/boxing_errors.html)
of the Rust By Example Book.

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### Functions
# Functions
Here, you'll learn how to write functions and how Rust's compiler can trace things way back.
#### Book Sections
## Further information
- [How Functions Work](https://doc.rust-lang.org/book/ch03-03-how-functions-work.html)

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### Generics
# Generics
In this section you'll learn about saving yourself many lines of code with generics!
Generics is the topic of generalizing types and functionalities to broader cases.
This is extremely useful for reducing code duplication in many ways, but can call for rather involving syntax.
Namely, being generic requires taking great care to specify over which types a generic type is actually considered valid.
The simplest and most common use of generics is for type parameters.
### Book Sections
## Further information
- [Generic Data Types](https://doc.rust-lang.org/stable/book/ch10-01-syntax.html)
- [Bounds](https://doc.rust-lang.org/rust-by-example/generics/bounds.html)

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### If
# If
`if`, the most basic type of control flow, is what you'll learn here.
#### Book Sections
## Further information
- [Control Flow - if expressions](https://doc.rust-lang.org/book/ch03-05-control-flow.html#if-expressions)

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### Macros
# Macros
Rust's macro system is very powerful, but also kind of difficult to wrap your
head around. We're not going to teach you how to write your own fully-featured
macros. Instead, we'll show you how to use and create them.
#### Book Sections
## Further information
- [Macros](https://doc.rust-lang.org/book/ch19-06-macros.html)
- [The Little Book of Rust Macros](https://danielkeep.github.io/tlborm/book/index.html)

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### Modules
# Modules
In this section we'll give you an introduction to Rust's module system.
#### Book Sections
## Further information
- [The Module System](https://doc.rust-lang.org/book/ch07-02-defining-modules-to-control-scope-and-privacy.html)

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### Move Semantics
# Move Semantics
These exercises are adapted from [pnkfelix](https://github.com/pnkfelix)'s [Rust Tutorial](https://pnkfelix.github.io/rust-examples-icfp2014/) -- Thank you Felix!!!
#### Book Sections
## Further information
For this section, the book links are especially important.

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### Option
# Option
#### Book Sections
Type Option represents an optional value: every Option is either Some and contains a value, or None, and does not.
Option types are very common in Rust code, as they have a number of uses:
- Initial values
- Return values for functions that are not defined over their entire input range (partial functions)
- Return value for otherwise reporting simple errors, where None is returned on error
- Optional struct fields
- Struct fields that can be loaned or "taken"
- Optional function arguments
- Nullable pointers
- Swapping things out of difficult situations
To learn about Option<T>, check out these links:
## Further Information
- [Option Enum Format](https://doc.rust-lang.org/stable/book/ch10-01-syntax.html#in-enum-definitions)
- [Option Module Documentation](https://doc.rust-lang.org/std/option/)

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### Primitive Types
# Primitive Types
Rust has a couple of basic types that are directly implemented into the
compiler. In this section, we'll go through the most important ones.
#### Book Sections
## Further information
- [Data Types](https://doc.rust-lang.org/stable/book/ch03-02-data-types.html)
- [The Slice Type](https://doc.rust-lang.org/stable/book/ch04-03-slices.html)

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For the Box exercise check out the chapter [Using Box to Point to Data on the Heap](https://doc.rust-lang.org/book/ch15-01-box.html).
# Standard library types
For the Arc exercise check out the chapter [Shared-State Concurrency](https://doc.rust-lang.org/book/ch16-03-shared-state.html) of the Rust Book.
This section will teach you about Box, Shared-State Concurrency and Iterators.
For the Iterator exercise check out the chapters [Iterator](https://doc.rust-lang.org/book/ch13-02-iterators.html) of the Rust Book and the [Iterator documentation](https://doc.rust-lang.org/stable/std/iter/).
## Further information
- [Using Box to Point to Data on the Heap](https://doc.rust-lang.org/book/ch15-01-box.html)
- [Shared-State Concurrency](https://doc.rust-lang.org/book/ch16-03-shared-state.html)
- [Iterator](https://doc.rust-lang.org/book/ch13-02-iterators.html)
- [Iterator documentation](https://doc.rust-lang.org/stable/std/iter/)

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### Strings
# Strings
Rust has two string types, a string slice (`&str`) and an owned string (`String`).
We're not going to dictate when you should use which one, but we'll show you how
to identify and create them, as well as use them.
#### Book Sections
## Further information
- [Strings](https://doc.rust-lang.org/book/ch08-02-strings.html)

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### Structs
# Structs
Rust has three struct types: a classic C struct, a tuple struct, and a unit struct.
#### Book Sections
## Further information
- [Structures](https://doc.rust-lang.org/book/ch05-01-defining-structs.html)
- [Method Syntax](https://doc.rust-lang.org/book/ch05-03-method-syntax.html)

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### Tests
# Tests
Going out of order from the book to cover tests -- many of the following exercises will ask you to make tests pass!
#### Book Sections
## Further information
- [Writing Tests](https://doc.rust-lang.org/book/ch11-01-writing-tests.html)

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For this exercise check out the [Dining Philosophers example](https://doc.rust-lang.org/1.4.0/book/dining-philosophers.html) and the chapter [Concurrency](https://doc.rust-lang.org/book/ch16-01-threads.html) of the Rust Book.
# Threads
In most current operating systems, an executed programs code is run in a process, and the operating system manages multiple processes at once.
Within your program, you can also have independent parts that run simultaneously. The features that run these independent parts are called threads.
## Further information
- [Dining Philosophers example](https://doc.rust-lang.org/1.4.0/book/dining-philosophers.html)
- [Using Threads to Run Code Simultaneously](https://doc.rust-lang.org/book/ch16-01-threads.html)

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### Traits
# Traits
A trait is a collection of methods.
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In this way, traits are somewhat similar to Java interfaces and C++ abstract classes.
Some additional common Rust traits include:
+ `Clone` (the `clone` method),
+ `Display` (which allows formatted display via `{}`), and
+ `Debug` (which allows formatted display via `{:?}`).
- `Clone` (the `clone` method)
- `Display` (which allows formatted display via `{}`)
- `Debug` (which allows formatted display via `{:?}`)
Because traits indicate shared behavior between data types, they are useful when writing generics.
#### Book Sections
## Further information
- [Traits](https://doc.rust-lang.org/book/ch10-02-traits.html)

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### Variables
# Variables
Here you'll learn about simple variables.
In Rust, variables are immutable by default.
When a variable is immutable, once a value is bound to a name, you cant change that value.
You can make them mutable by adding mut in front of the variable name.
#### Book Sections
## Further information
- [Variables and Mutability](https://doc.rust-lang.org/book/ch03-01-variables-and-mutability.html)