move contributing

CONTRIBUTING.md

-Contributing
-------------
-
-Do it!

CONTRIBUTING.rst

+You want to hack new features into ``km3buu`` or are just here to fix a
+bug? Here's what you need to know:
+
+If there are any questions please join https://chat.km3net.de and ask in the #software
+or #simulation channel.
+
+For general questions and suggestions please open an issue under:
+
+https://git.km3net.de/simulation/km3buu/-/issues
+
+or if you already have code ready go ahead and please open up and merge request (MR) at:
+
+https://git.km3net.de/simulation/km3buu/-/merge_requests .
+
+In order to get an complete overview over all the issues please also check out:
+
+https://git.km3net.de/simulation/km3buu/-/boards
+
+Feel free to contribute, we appreciate all ideas/suggestions/improvements 
+
+.. raw:: html
+
+   👍

doc/contribute.rst

 Contribute
 ==========
 
-You want to hack new features into ``km3buu`` or are just here to fix a
-bug? Here's what you need to know:
-
-If there are any questions please join https://chat.km3net.de and ask in the #software
-or #simulation channel.
-
-For general questions and suggestions please open an issue under:
-
-https://git.km3net.de/simulation/km3buu/-/issues
-
-or if you already have code ready go ahead and please open up and merge request (MR) at:
-
-https://git.km3net.de/simulation/km3buu/-/merge_requests .
-
-In order to get an complete overview over all the issues please also check out:
-
-https://git.km3net.de/simulation/km3buu/-/boards
-
-Feel free to contribute, we appreciate all ideas/suggestions/improvements 
-
-.. raw:: html
-
-   👍
+.. include:: ../CONTRIBUTING.rst