Create CONTRIBUTING.md with contribution instructions

Added contributing guidelines for the project.

Author: anandi-mahure

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in this project!
+
+## How to Contribute
+
+1. Fork the repository
+2. Create a new branch (`git checkout -b feature/your-feature`)
+3. Make your changes
+4. Run the test suite (`pytest tests/ -v`)
+5. Commit your changes (`git commit -m "Add your feature"`)
+6. Push to the branch (`git push origin feature/your-feature`)
+7. Open a Pull Request
+
+## Running Tests
+```bash
+pytest tests/ -v
+```
+
+## Code Style
+
+- Follow PEP 8 for Python code
+- Add docstrings to all functions
+- Ensure all tests pass before submitting a PR
+
+## Questions
+
+Feel free to reach out via [LinkedIn](https://www.linkedin.com/in/anandirm/)