Enhance docstrings in the Chess Game project and Update the Readme file

[Gabriela20103967]

Description

This pull request updates the docstrings and documentation for the Chess Game project, to ensure that all methods are well-documented and easy to understand. And for the Readme file I updated it with the Game instruction, features and the information of the classes and methods.

A short summary of what is included in your Pull Request.

Fixes #275

• Issue_no: <275>
• Not applicable

Type of change

Choosing one or more options from the following as per the nature of your Pull request.

• New project insert
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation Update

Project

• Project Name: Chess Game

• Short Description: Provide a short desctiption of your Python project

Checklist:

Please tick all the boxes that are fulfilled by your Pull Request.

• I have named my files and folder, according to this project's guidelines.
• My code follows the style guidelines of this project.
• I have commented on my code, particularly in hard-to-understand areas.
• I have created a helpful and easy to understand README.md, according to the given README_TEMPLATE.
• My changes do not produce any warnings.