chore: add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Anybody is welcome to propose or create a change. It is appreciated for larger changes that a
+notification and some discussion is made before moving forwards with such changes. Small changes
+and improvements are always welcome via pull request.
+
+It is expected that all contributions follow the relevant processes and conduct specified below.
+
+## Pull Request Process
+
+1. Please make sure to update relevant documentation, when applicable to your pull request
+2. Pull requests commits should follow [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) guidelines. Merges are not allowed to keep a linear history (rebase only), therefore its important to keep the history clean
+3. Please mention a codeowner to get eyes on your pull request
+4. Once approved, you or a codeowner may merge the change
+
+## Code of Conduct
+
+Be empathetic - everyone is coming from their own background, priorities, challenges and mindset.