feature: add Chinese README.md

[gg1229505432]

• Do only one thing
• Non breaking API changes
• Tested

What did this pull request do?

feature: add Chinese README.md | 增加中文文档README_CN.md

User Case Description

There are many people who use the project in China, and a Chinese document is required.

[gg1229505432]

Recently, a lot of problems have been solved in Issues, and the questions that need to be closed are @ you. Thank you for designing such a great open source project.
最近在Issues中解决了很多问题, 需要close的问题都@你了. 感谢你设计出了这么优秀的开源项目.

[jinzhu]

Hi 你好，

感谢贡献，感觉可以调整一下翻译，翻译方式至少和 https://gorm.cn/zh_CN/ 保持一致，当然也欢迎调整 https://gorm.cn/zh_CN/ 里的内容，一致即可，希望翻译文档目标是让人更好的理解，不只是多了一个翻译 😘