Add Welcoming Instructions

Author: hannogrimm

README.md

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+# Administrative Repository of the Student Council
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+You can find the current and all past versions of the [Statute](statute) and [Rules of Procedure of the Student General Assembly]((rules-of-procedure)) here. 
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+This repository shall serve as the interface for discussions around future amendments to the Rules of Procedure. We will utilize Pull Requests for suggesting, discussing and potentially updating the Rules of Procedure. 
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+You can find Contribution Guidelines to the documents in the respective folders.
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+If you look for general up-to-date information around the Student Council instead, please refer to [our Notion page](https://www.notion.so/codeuniversitywiki/Student-Council-5aba73d8b9ad474484c3a11fd169c6d7).
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