added CoffeeScript in Chinese

free-programming-books-zh.md

@@ -9,6 +9,7 @@
     * [正则表达式](#正则表达式)
 * [C](#c)
 * [C++](#c-1)
+* [CoffeeScript](#coffeescript)
 * [Erlang](#erlang)
 * [Fortran](#fortran)
 * [Golang](#golang)
@@ -93,6 +94,12 @@
 * [C++ 并发编程指南](https://github.com/forhappy/A-Detailed-Cplusplus-Concurrency-Tutorial)
 
 
+### CoffeeScript
+* [CoffeeScript 中文](http://coffee-script.org/)
+* [CoffeeScript 中文手册](http://island205.github.io/tlboc/) (《The Little Book on CoffeeScript》中文版)
+* [CoffeeScript Cookbook](http://island205.github.io/coffeescript-cookbook.github.com/)
+
+
 ### Erlang
 * [Erlang 并发编程](https://github.com/liancheng/cpie-cn) (《Concurrent Programming in Erlang (Part I)》中文版)