DOC: Add CONTRIBUTING.md and CODE_OF_CONDUCT.md for Contributor Onboarding

### Issue with current documentation:

Hi @AyaNady17

I would love to work on this issue and contribute to the project.

I can add both the following files with proper and well-structured content:

CONTRIBUTING.md – including project setup instructions, contribution guidelines, pull request process, and community practices.

CODE_OF_CONDUCT.md – based on the Contributor Covenant, to help promote a safe, respectful, and inclusive environment for everyone.

These additions will improve onboarding for new contributors and ensure consistent collaboration within the community.

Kindly assign this issue to me so I can start working on it. Looking forward to contributing!

Thank you!