Add Readme.md for Chinese.

[bdim404]

I've added a full Chinese version!

[SpacingBat3]

I kinda felt uneasy about translating official docs, mostly because I wanted them to be maintained only by actual project maintainers and kept up-to-date. And given how fast WebCord does really change, it's easy for the docs to be actually outdated; I think even Polish official docs are out of sync right now with the English version and for those I've only translated.

I guess might reconsider this a bit. Maybe I'll do simple checks before merging it (in case of docs), like with Google Translate or sth...

Also, for some reason, I have a feeling that projects in general with Chinese docs are perceived like they are allowed for conversation to be made in Chinese (possibly due to my interest in Android modding community, which tends to be flooded with the maintainers from Asian countries) . I'm kinda uneasy with that fact (I don't really know Chinese, I guess that should be obvious by looking at the commits / repo at the current state); please add a disclaimer (if you didn't; I hardly checked the translation for now) that those docs are maintained by the community, they might be outdated and that you should prefer communicating in English with the maintainers (me).

[bdim404]

Don't worry, I'll gradually keep following up on the translation.

And I will add a disclaimer!