Proposal: Add Chinese (Simplified) Translation for README

[EnderRomantice]

Hi there 👋

I've been using opencode and found it really helpful! Thanks for all the great work.

I'd like to propose adding a Simplified Chinese translation of the README.md to make it more accessible to Chinese-speaking users who might find the English version challenging.

I'm happy to contribute the translation myself and submit a pull request. The translated file would be named something like README.zh-CN.md, or placed in a docs/ folder if you have a preference.

Would you be open to accepting such a contribution? I understand that maintaining multiple language versions can add overhead, so I'd like to check your thoughts first.

Let me know what you think! 😊