Add codefix providers to project.

1. fix property set accessor to:
   1.1. init
   1.2. private set

2. change mutable collection to immutable analog e.g.
   List<> -> IReadOnlyLst
Dictionary<,> -> ImmutableDictionary<,> or IReadOnlyDictionary<,>
   and etc.

Source Location: PropertyTypeAnalyzerTests.cs

One of the tests fails with CS0246 with argument IReadOnlySet<>.
Need to find out reason and fix it.

Need to rework doxygen documentation with:

• public attribute refences
• instalation instructions

Problem
.NET community have a nice package managment system. It's very hard and painfull to intergrate and use this tool in other projects by adding this manually, from github.

Solution
Pack this analyzer and publish on Nuget

Code fix provider for IM0002 diagnostic must be refactored.

Need to move actions to separate classes with Strategy pattern implementation.

Need to cover by tests this functionality.

Short description

User defined classes, which marked by Immutable attribute, don't violates immutability of other classes.

Example

In code below, in class Example, property ImmutableExample shouldn't raise diagnostic, because property type (ImmutableExample) is immutable.

[Immutable]
public class ImmutableExample
{
    public int Id { get; init; }
}

public class NotImmutableExample
{
    public List<int> Ints { get; set; } = new();
}

[Immutable]
public class Example
{
    public ImmutableExample ImmutableExample { get; init; } = new();
    public NotImmutableExample MutableExample { get; init; } = new();
}