update README.cn.md (#43483)
update README.cn.md (#43483)

* feat: create README.cn.md

* chore: add Chinese README

* feat: Switch status badges to Azure Pipelines in README.cn.md

* docs: Readme TOC

* docs: improve readme.cn on external dependencies

* style: use full-width characters

* docs: update README.cn.md

* fix: format
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