[ADD] add uc scrat

Author: xiaokaike

README.md

@@ -395,6 +395,7 @@ https://github.com/jsfront/src/blob/master/qq.md
 - [腾讯html5](http://cube.qq.com/)
 - [奇舞团开源项目](http://75team.github.io/)
 - [Qunar UED](http://ued.qunar.com/)
+- [Scrat](http://scrat.io)
 
 ####2. Javascript