add language Chinese

[mikelyou]

Hi, I just tried adding Simplified Chinese to this wonderful game!

Although I'm not sure how to translate some words, you can trust that 90% of the work is done well. Comments like //不确定 are left in zh.ts indicating the translation might not be precise, or the translator(that's me) was uncertain about the meaning. I will polish them in the future, or leave them for others.

Please feel free to ask me questions. Hope this will help. 😄

[vercel[bot]]

@mikelyou is attempting to deploy a commit to the Pelica Team on Vercel.

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