add link to @skyronic tutorial

Author: yyx990803

README.md

@@ -8,7 +8,8 @@
 
 ## NOTE: Vuex is still in development - API may change anytime.
 
-[Documentation](http://vuex.vuejs.org/)
+- [Documentation](http://vuex.vuejs.org/)
+- [Great introduction and explanation by @skyronic](http://skyronic.com/2016/01/03/vuex-basics-tutorial/)
 
 ## Examples