Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing guidelines
+
+Thank you very much for contributing! Every help is welcome :).
+
+## Workflow
+
+If you have a bugfix, feel free to create a PR. If you have a feature request you can open an issue (or a PR if you already have code).
+
+## Code guidelines
+
+Here are some guidelines we ask to follow:
+
+- The used language is English.
+- Files should be UTF-8.
+- Everything should come with as much [tests](./tests) as possible.
+- The readability of code is very important.
+- Formatting and linting is checked in the PR, please adhere to these checks. You can check the [CI/CD pipeline](./.github/workflows/test-deploy.yml) for the exact checks.