Add Chinese README file
Add Chinese README file

Add Chinese README file named README_CN.md which is located at root
directory of DNA project. README_CN file should be updated first when
new feature comes in. This file is mainly used for Chinese users and
keep track of latest changes.

Signed-off-by: Ziyan Zhou <9ec1711f94f3f1a72dd235a6dd297ca63064303b@hotmail.com>

qingche123/DNA,qingche123/DNA,luodanwg/DNA,sharpbear/DNA,dreamfly281/DNA,zhouziyan/DNA,superJinQing/DNA,dreamfly281/DNA,BooniesFX/DNA,zhengq1/DNA,zhengq1/DNA,BooniesFX/DNA,zhouziyan/DNA,superJinQing/DNA,luodanwg/DNA,sharpbear/DNA