Create CONTRIBUTING.md

Author: isenmann

CONTRIBUTING.md

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+# Contributing to OpenSaberVR
+
+:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
+
+The following is a set of guidelines for contributing to OpenSaberVR, which is hosted [here](https://github.com/isenmann/OpenSaberVR) on GitHub. These are mostly guidelines, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request.
+
+[How Can I Contribute?](#how-can-i-contribute)
+  * [Pull Requests](#pull-requests)
+  * [Reporting Bugs and Suggesting Enhancements](#reporting-bugs-and-suggesting-enhancements)
+  
+## How Can I Contribute?
+
+### Pull Requests
+In order to maintain pull requests better and therefor faster, please do a pull request always from and to the develop branch. Also make sure that you always do it from the latest HEAD. 
+This is the ongoing development branch where all the new stuff comes in. The master branch is only a reference for the releases.
+OpenSaberVR's development is done with the Gitflow Workflow model.
+
+### Reporting Bugs and Suggesting Enhancements
+If you find a bug or have a very good idea for OpenSaberVR, don't hesitate to fill out a new issue [here](https://github.com/isenmann/OpenSaberVR/issues/new). Please make sure that you fill out everything correctly and also to set the correct labels, so that they can be classified.