Create CONTRIBUTING.md

CONTRIBUTING.md

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+# How to contribute
+
+All contributions welcome 
+- Ideas, feature requests 💡
+- bug reports 🪲
+- documentation 📃
+- sample files 🌫️
+- tests 
+- rust code 🦀
+- python code 🐍
+- tell your friends, share the project online / via social media, ... 🗣️
+
+## Best practice 
+
+If you know how, you should fork the repo, create a new branch and then submit a pull request.
+
+(If you are new to GitHub, you might start with a basic tutorial and check out a more detailed guide to pull requests.)
+
+Pull requests will be evaluated by the repository guardians on a schedule and if deemed beneficial will be committed to main.
+
+By contributing to this project, you grant a world-wide, royalty-free, perpetual, irrevocable, non-exclusive, transferable license to all users under the terms of the license under which this project is distributed.