Compliance bulk update. Add CONTRIBUTING.md

Author: renelehmann

CONTRIBUTING.md

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+# Contributing
+
+We welcome contributions and are really glad about your involvement in the project.
+
+## Reporting Feedback
+
+Use GitHub’s issues feature to report problems with and request enhancements to the functionality or documentation.
+
+## Contributing Code
+
+Code contributions are highly appreciated. Bug fixes and small enhancements can be handed in as pull-requests. For larger changes and features, please open a GitHub issue with your proposal first so the solution can be discussed.
+
+### Commit Guidelines
+
+All your commits must follow the [conventional commit message format](https://www.conventionalcommits.org/en/v1.0.0/#summary).
+
+Valid scopes for this project are:
+
+- `editor`: changes to the script editor GUI
+- `runner`: changes to the script execution logic
+- `meta`: changes to the build process, deployment, packaging or the project setup
+
+Commits that fall into none of these scopes or change aspects in more than one of them should not specify a scope.
+
+Ideally, each commit should should represent a working and buildable state but still only contain an atomic change compared to its parent. Please rewrite history accordingly before opening a PR.
+
+### License
+
+By contributing code or documentation, you agree to have your contribution licensed under [our license](/LICENSE).