Add CONTRUBUTING rules

Signed-off-by: gearnode <bryan@frimin.fr>

CONTRIBUTING.md

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+# Contributing
+Thank you for your interest in contributing to our project! 
+
+## How to Contribute
+
+1. Fork the repository
+2. Create a new branch for your changes
+3. Make your changes
+4. Sign your commits with DCO:
+   ```sh
+   git commit -s -m "Your commit message"
+   ```
+5. Push to your fork and submit a pull request
+
+## Developer Certificate of Origin
+
+We use the Developer Certificate of Origin (DCO) in lieu of a
+Contributor License Agreement (CLA) for all contributions to this
+project. DCO is a legally binding statement that asserts that you are
+the creator of your contribution and that you wish to allow us to use
+it in this project.
+
+
+When you contribute to this repository with a pull request, you need
+to sign-off that you agree to the DCO. You do this by adding a
+`Signed-off-by` line to your commit messages containing your name and
+email:
+
+```
+git commit -s -m "Your commit message"
+```
+
+This will automatically add a sign-off message to your
+commit. Alternatively, you can manually add:
+
+```sh
+Signed-off-by: John Doe <john.doe@example.org>
+```
+
+## Code Guidelines
+
+- Keep code clean and simple
+- Follow existing code style
+- Update documentation if needed
+
+## Need Help?
+
+Create an issue if you:
+- Found a bug
+- Have a feature request
+- Need help with something
+
+Thank you for contributing!