docs(readme): add wiki-page

Author: dalisoft

README.md

@@ -114,6 +114,7 @@ git reset --hard
 
 * Original source: <a href="https://github.com/tweenjs/tween.js">check out at here</a>
 * [User guide](./docs/user_guide.md)
+* [Wiki page](https://github.com/tweenjs/es6-tween/wiki)
 * [Compatiblity](./compatibility/comp_support.md)
 * [Tutorial](http://learningthreejs.com/blog/2011/08/17/tweenjs-for-smooth-animation/)  using tween.js with three.js