Create CONTRIBUTING.md

Zabuzard · web-flow · commit 94978a91a1ed · 2023-01-11T11:43:31.000+01:00
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+# Welcome to the Modern Java project!
+
+First off, thank you for considering contributing to Modern Java. :tada:
+
+Modern Java is an open source project, and we love to receive contributions from our community — **you**!
+
+## How to contribute
+
+Please head over to the [Wiki](https://github.com/Together-Java/ModernJava/wiki) and in particular check out the article [Contributing](https://github.com/Together-Java/ModernJava/wiki/Contributing) to learn more about this project and how you can make it a better place.
