add zh-CN readme

[Naylor55]

Summary

• Added README.zh-CN.md — a full Chinese (Simplified) translation of the English README
• Added language switch links at the top: [English](README.md) | [日本語版](docs/README.ja.md)

Notes

• All code blocks, badges, tables, and project structure diagrams are preserved as-is
• Internal documentation links (docs/*.md) are kept unchanged; only their display titles are translated
• Technical terms (e.g., VRAM, GGUF, MoE, KV cache) are retained in English where appropriate, with Chinese explanations provided contextually

[Andyyyy64]

Thanks for adding this. A Simplified Chinese README would be really helpful.

I found one small thing to fix before we merge it. Since this file is under docs/, a few relative links currently point to the wrong place on GitHub.

Could you adjust these paths?

• README.md to ../README.md
• docs/README.ja.md to README.ja.md
• assets/demo.gif and assets/demo-run.gif to ../assets/...
• docs/*.md links to sibling docs files, like cli.md
• CONTRIBUTING.md to ../CONTRIBUTING.md

It would also be good to add a link from the main README.md to docs/README.zh-CN.md, so people can find the new translation.

Once those are fixed, I will take another look.