[fork] Fork document

FORK.md

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+# Fork and heritage
+
+This project is a fork of [Spotify Docker Client][] after being declared mature
+and development of new features and non-critical issues was frozen. It was originally
+developed by an infrastructure team at [Spotify][] comprised by the following members
+(according to the original `pom.xml`):
+
+* Daniel Norberg ([email protected])
+* Ryan Culbertson ([email protected])
+* Drew Csillag ([email protected])
+* Philip Cristiano ([email protected])
+* Rohan Singh ([email protected])
+* David Xia ([email protected]) and
+* Matt Brown ([email protected])
+
+Other people contributed to the project can be found at the original [Contributors list][]
+
+[Spotify Docker Client]: https://github.com/spotify/docker-client
+[Spotify]: https://www.spotify.com
+[Contributors list]: https://github.com/spotify/docker-client/graphs/contributors