* add file CONTRIBUTING.zh_cn.md as a chinese version for CONTRIBUTING.md
* Update CONTRIBUTING.md
* Update CONTRIBUTING.zh_cn.md
* Update CONTRIBUTING.ko_kr.md
* Update CONTRIBUTING.ar.md
* Update CONTRIBUTING.zh_cn.md
Resolve some grammar issue and syntax errors . @liyishuai And thank you for your reviews
* Update CONTRIBUTING.zh_cn.md
* Update CONTRIBUTING.zh_cn.md
* Update CONTRIBUTING.zh_cn.md
Co-authored-by: James Harris <wopian@wopian.me>