add chinese simplified for React/JSX style guide

Author: JasonBoy

react/README.md

@@ -505,4 +505,10 @@
 
   [anti-pattern]: https://facebook.github.io/react/blog/2015/12/16/ismounted-antipattern.html
 
+## Translation
+
+  This JSX/React style guide is also available in other languages:
+  
+  - ![cn](https://raw.githubusercontent.com/gosquared/flags/master/flags/flags/shiny/24/China.png) **Chinese (Simplified)**: [JasonBoy/javascript](https://github.com/JasonBoy/javascript/tree/master/react)
+
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