message: doc(readme): add note about contributing and chat links
diff: @@ -25,3 +25,18 @@ hyper makes use of "async IO" (non-blocking sockets) via the
  Be aware that hyper is still actively evolving towards 1.0, and is likely
  to experience breaking changes before stabilising. You can also see the
  [issues in the upcoming milestones](https://github.com/hyperium/hyper/milestones).
  +
  +## Contributing
  +
  +To get involved, take a look at [CONTRIBUTING](CONTRIBUTING.md).
  +
  +There are two main avenues for real-time chatting about hyper: a [Gitter room][gitter]
  +and [irc.mozilla.org/hyper][irc]. They are mirrored, so choose whichever format you
  +prefer.
  +
  +[gitter]: https://gitter.im/hyperium/hyper
  +[irc]: https://kiwiirc.com/nextclient/irc.mozilla.org/#hyper
  +
  +## License
  +
  +hyper is provided under the MIT license. See [LICENSE](LICENSE).
  