Add Chinese document.

[HashCookie]

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Add Chinese document, Hope to help more Chinese developers. I have read the CLA Document and I hereby sign the CLA

[withfig-bot]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[withfig-bot]

No files changed ☑️

[withfig-bot]

Hello @HashCookie, thank you very much for creating a Pull Request! Here is a small checklist to get this PR merged as quickly as possible:

• [ ] Do all subcommands / options which take arguments include the args property (args: {})?
• [ ] Are all options modular? E.g. -a -u -x instead of -aux
• [ ] Have all other checks passed?

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[mschrage]

You need to leave the CLA text in a separate comment. Can you do that and then we can get this merged in?