Add Contributing Guidelines

Author: ShinryakuTako

CONTRIBUTING.md

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+Please check the [TODO & Roadmap][todo] to see what this project is currently missing and where you could help out.
+
+If you have an idea, suggestion, code or any other contribution, please open a new issue or pull request on the [OctopusKit repository][repository].
+
+[repository]: https://github.com/invadingoctopus/octopuskit
+[todo]: https://invadingoctopus.io/octopuskit/documentation/todo.html