Add CHANGELOG

CHANGELOG.md

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+# Snikket Server changelog
+
+## Alpha.20200513
+
+- Add STUN/TURN service to facilitate audio/video calls (see note below)
+- Fix hanging on `docker stop`
+
+If you are upgrading from a previous version, this version requires some changes.
+Please see the [upgrade notes](https://gist.github.com/mwild1/aa2af95b520bd44283d9062e7846a874)!
+
+## Alpha.0
+
+- Initial release!