Create CONTRIBUTING.md with contribution guidelines

Added guidelines for contributing to the project.

CONTRIBUTING.md

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+# Contributing
+
+Thanks for your interest in contributing to this project!
+
+## How to Contribute
+
+1. Fork the repository.
+2. Create a new branch for your changes.
+3. Make your changes.
+4. Test your changes.
+5. Open a Pull Request.
+
+## Pull Requests
+
+Please make sure that:
+
+- Your code is clean and easy to understand.
+- Your changes are relevant to the project.
+- You have tested your changes before submitting the Pull Request.
+- Your Pull Request clearly explains what was changed.
+
+## Issues
+
+If you find a bug, please open an issue and provide:
+
+- A description of the problem.
+- Steps to reproduce it.
+- Your environment and version.
+- Any relevant logs or screenshots.
+
+For security vulnerabilities, please follow the instructions in `SECURITY.md`.
+
+Thanks for contributing!