docs: update readme

Author: json-q

README-en-US.md

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+# React Mini Playground
+
+[中文](./README.md)
+
+React simply implements features like [vue playground](https://play.vuejs.org)
+
+## Features
+
+Implement the core functionality of Vue Playground.
+
+- [x] Support TypeScript
+- [x] Real-time preview
+- [x] Add, edit, and delete multiple files
+- [x] Error handling for preview
+- [x] Share link
+- [x] File download
+- [x] Long task Worker optimization for Babel compilation
+
+> I believe using `Vite` can provide a better development experience. Although `rspack` and `rsbuild` already support `?raw` resources, it feels not yet fully refined.

README.md

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 # React mini playground
+
+[English](./README-en-US.md)
+
+React 简单实现 [vue playground](https://play.vuejs.org) 的功能。
+
+## 功能
+
+实现 vue playground 的核心功能
+
+- [x] 支持 TypeScript
+- [x] 实时预览
+- [x] 多文件的增删改
+- [x] 预览的错误捕获
+- [x] 链接分享
+- [x] 文件下载
+- [x] babel 编译时的长任务 worker 优化
+
+> 我认为这种功能，使用 `vite` 可以带来更好的开发体验。`rspack` 和 `rsbuild` 虽然已支持 `?raw` 资源，但感觉并不完善