Enhancement: Restructure File Organization and Add README

[peymansf2000]

This pull request introduces changes to enhance the organization of the repository and provide a clear guide for users.

1. File Structure Restructuring:

   • Created a dedicated /src directory for design pattern source code.
   • Aligned the file structure with the outlined content in the README for better clarity.

2. README Documentation:

   • Added an initial README.md file providing an overview of the repository.
   • Highlighted the focus on design patterns with a link to associated video tutorials on the course website.

These changes aim to improve the user experience and make the tutorial materials more accessible. Please review and merge as appropriate.