Adds an additional example (#307)

Adds an example that explains how to use Vuex in the context of building a realtime app with Feathers.js on the backend.

README.md

@@ -9,6 +9,7 @@
 - [Documentation](http://vuejs.github.io/vuex/)
 - [Great introduction and explanation by @skyronic](http://skyronic.com/2016/01/03/vuex-basics-tutorial/) (using outdated 0.3.0 API, but still worth a read!)
 - [Vuex introduction video - James Browne from London Vue.js Meetup #1](https://www.youtube.com/watch?v=l1KHL-TX3qs)
+- [Feathers.js example using Vue.js and Vuex on the client to maintain state](https://github.com/niallobrien/feathers-chat-example) by [Niall O'Brien](https://github.com/niallobrien) (Twitter: [@niall_obrien](https://twitter.com/niall_obrien))
 
 ## Examples