添加《GitBook简明教程》

README.md

@@ -612,6 +612,7 @@
 * [中文文案排版指北](https://github.com/sparanoid/chinese-copywriting-guidelines)
 * [Standard C 语言标准函数库速查 (Cheat Sheet)](http://ganquan.info/standard-c/)
 * [Git Cheatsheet Chs](http://gh.amio.us/git-cheatsheet-chs/)
+* [GitBook简明教程](http://www.chengweiyang.cn/gitbook/index.html)
 * [JavaScript语言精粹](https://github.com/qibaoguang/Study-Step-by-Step/blob/master/%E8%AF%BB%E4%B9%A6%E7%AC%94%E8%AE%B0/javascript_the_good_parts.md)
 * [制造开源软件](http://producingoss.com/zh/)
 * [提问的智慧](http://www.dianbo.org/9238/stone/tiwendezhihui.htm)