message: Updates the CONTRIBUTING.md file
diff: # How to Contribute?
  -This file is a TODO
  -
  Please just chat with us on gitter :)
  +But in generall you have to follow these steps:
  +
  +1. Fork it
  +2. Create your feature branch (git checkout -b my-new-feature)
  +3. Commit your changes (git commit -am 'Add some feature')
  +4. Push to the branch (git push origin my-new-feature)
  +5. Create new Pull Request
  +
  +Please note that we only accept PRs with a running CI and properly written tests!
  +
  