Add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Before starting your work on this module, you should
+[fork the project](https://help.github.com/articles/fork-a-repo/) to your
+GitHub account. This allows you to freely experiment with your changes. When
+your changes are complete, submit a
+[pull request](https://help.github.com/articles/using-pull-requests/). All pull
+requests will be reviewed and merged if they suit some general guidelines:
+
+* Changes are located in a topic branch
+* For new functionality, proper tests are written
+* Changes should not solve certain problems on special environments
+
+## Issue Tracker
+If you think your changes need further discussion, you found a bug or have a
+feature request, create an issue on [GitHub](https://github.com/Icinga/icingabeat/issues). The issue number should
+be used in your branch name as reference to a certain bug or feature discussion.
+
+## Branches
+Choosing a proper name for a branch helps us identify its purpose and possibly
+find an associated bug or feature. Generally a branch name should include a
+topic such as `bug` or `feature` followed by a description and an issue number
+if applicable. Branches should have only changes relevant to a specific issue.
+
+```
+git checkout -b bug/field-type-missing-1234
+git checkout -b feature/new-setting-for-foo-1235
+```