Create CONTRIBUTING.md

CONTRIBUTING.md

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+# How to contribute
+We welcome all contributions, be it writing documentation, raising issues, improving the code, etc.
+
+## General Approach
+Please submit your contributions via a Pull Request.
+
+## License
+We only accept contributions that follow the given License of the project. If you disagree with this point, please clearly mention it in your pull request. Without any notification, we assume your contribution follows the 3-clause BSD license.
+
+## Avoid Violations
+Make sure that you do not violate any intellectual property rights or other legal jurisdictions and rights when contributing to this project.