Enhance README with contribution examples and style guide

[MiguelAntonioRS]

What would you like to share?

The project could benefit from clearer documentation in the README, including:

How to run tests locally
Code formatting standards
Example of contributing a new algorithm

Additional information

No response

[siriak]

I think it's best to add it to CONTRIBUTING.md

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contribution!