add CONTRIBUTING

CONTRIBUTING.md

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+# Contributing to gridscale-check
+
+## Development workflow
+
+* Development is done on the `develop` branch.
+* Releases are cut from the `master` branch.
+* For anything larger than single commits, please use feature/bugfix branches.
+
+## Reporting Bugs or Enhancement Requests
+
+Please submit bugs or enhancement requests through the public bug tracker within the
+github project.
+
+## Submitting Patches
+
+The gridscale-check source code is managed using the git distributed source control 
+management tool <https://www.git-scm.org/>. Please submit patches accordingly.
+