Add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+
+## Response Times
+
+This project is developed and maintained by an infrastructure team at Spotify. Lots of teams at
+Spotify use relatively recent versions of this project in production for mission-critical systems.
+
+That being said, this is our day job where our primary users are our colleagues.
+So we might be slow in getting back to you because we're busy working on Spotify-specific things
+or because your issues are being prioritized behind those of our colleagues.
+
+Please poke us if you feel you're being neglected, and we'll do our best to get back to you.
+
+## Related Tools You May Find Useful
+
+If you like this project, you might also like [Helios][2], [docker-client][3], [docker-gc][4],
+[helios-skydns][5], and [helios-consul][6].
+
+## Reporting Bugs
+
+Please make sure you're using the latest version. This project is
+released continuously as it's developed so new releases come out almost as frequently as we
+commit to master.
+
+## Contributing
+
+Before creating a new issue, see if there's already an existing issue.
+
+If you create a minor bugfix, feel free to submit a PR.
+If your PR is for a significant change or a new feature, feel free to ask for our feedback
+before writing code to check we're on the same page.
+
+You can build and test by following [instructions here][1].
+
+  [1]: https://github.com/spotify/docker-maven-plugin#testing
+  [2]: https://github.com/spotify/helios
+  [3]: https://github.com/spotify/docker-client
+  [4]: https://github.com/spotify/docker-gc
+  [5]: https://github.com/spotify/helios-skydns
+  [6]: https://github.com/spotify/helios-consul

README.md

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       </server>
     </servers>
 
+## Testing
+
+Make sure Docker daemon is running and that you can do `docker ps`. Then run `mvn clean test`.
+
 ## Releasing
 
 Commits to the master branch will trigger our continuous integration agent to build the jar and