Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+We love your input! We want to make contributing to this project as easy and transparent as possible, whether it's:
+
+- Submitting a fix
+- Implementing new features
+- Becoming a maintainer
+
+## We Develop with Github
+When contributing to this repository, please first discuss with the owners of this repository before making a change. To do so, create a new issue.
+
+## Pull Request Process
+
+1. Fork the repo and create your branch from `main`.
+2. If you've added code, test it for GNOME shell versions <= 44 and >= 45. (If don't know how to do it, don't worry, we can do it for you!)
+3. If you've changed behaviour, record a demonstration video or describe what's new.
+4. Ensure the other features are still working.
+5. Make sure your code lints.
+6. Issue that pull request! 🥳
+
+## Any contributions you make will be under the GPLv2 Software License
+In short, when you submit code changes, your submissions are understood to be under the same [GPLv2 License](https://github.com/domferr/tilingshell/blob/main/LICENSE) that covers the project. 
+Feel free to contact the maintainers if that's a concern.