Feature/update documentation

[oswaldsql]

This pull request includes several updates to the README.md file and the addition of new Architecture Decision Records (ADRs) for the MiniMock project. The changes improve documentation clarity, add a table of contents, and introduce new ADRs to document important architectural decisions.

Improvements to README.md:

• Added a table of contents for better navigation and readability.
• Corrected typos and improved consistency in terminology (e.g., "summery" to "summary", "Maitinance" to "Maintenance").
• Enhanced examples and explanations for various features, including fluent interface, simple return values, and async methods. [1] [2] [3]
• Added a link to the documentation.

New Architecture Decision Records (ADRs):

• Introduced ADRs to document key architectural decisions, including general and feature-specific ADRs.
• Added ADRs for unsupported features, such as extension methods, sealed classes, and static members. [1] [2] [3]
• Detailed decisions on supporting classes and interfaces, creating mocks, supporting constructors, and events. [1] [2] [3] [4]