📝 Added CONTRIBUTING.md

CONTRIBUTING.md

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+# Contribute to ClassQuiz
+
+For the development-setup, please check out the
+docs: [classquiz.mawoka.eu/docs/develop](https://classquiz.mawoka.eu/docs/develop)
+
+## Formatting git-commits
+
+Please use [Gitmoji](https://gitmoji.dev/) to format your commits.
+
+## Opening PRs
+
+Just do so.
+
+## Found a bug
+
+If it is a security-related bug, please contact me at [mawoka.eu/contact](https://mawoka.eu/contact). If not, just open
+an issue here on GitHub.
+
+**Please try to reproduce the bug with the adblocker disabled**, so I will be able to see the bug in Sentry.
+
+## Want to translate?
+
+Go to [Weblate](https://translate.mawoka.eu/projects/classquiz/frontend/). If the language isn't available, please open
+an issue here, so I'll be able to add it.