add Chinese README.md
Recently, a lot of problems have been solved in Issues | 我最近在Issues中解决了很多问题
And the questions that need to be closed are @ jinzhu. But Jinzhu did not reply. Thank you for designing such a great open source project. 需要close的问题都@jinzhu了. 但是jinzhu并没有回复. 感谢你设计出了这么优秀的开源项目. 想共享一些 feature code, fix code, 但是发现issues没有什么bug, 都是操作者自己搞出来的bug, 实在不知道写什么code了, 只能是增加中文文档了.