docs: add Chinese README

Author: afc163

README.md

@@ -4,6 +4,8 @@
   <p>🔽 A trigger-driven dropdown component for React.</p>
 </div>
 
+<p align="center">English | <a href="./README.zh-CN.md">简体中文</a></p>
+
 
 <div align="center">
 

README.zh-CN.md

@@ -0,0 +1,114 @@
+<div align="center">
+  <h1>@rc-component/dropdown</h1>
+  <p><sub>Ant Design 生态的一部分。</sub></p>
+  <p>⬇️ React 下拉菜单基础组件，基于 trigger 和 menu 能力构建。</p>
+</div>
+
+<p align="center"><a href="./README.md">English</a> | 简体中文</p>
+
+
+<div align="center">
+
+[![NPM version][npm-image]][npm-url] [![npm download][download-image]][download-url] [![build status][github-actions-image]][github-actions-url] [![Codecov][codecov-image]][codecov-url] [![bundle size][bundlephobia-image]][bundlephobia-url] [![dumi][dumi-image]][dumi-url]
+
+</div>
+
+[npm-image]: https://img.shields.io/npm/v/@rc-component/dropdown.svg?style=flat-square
+[npm-url]: https://npmjs.org/package/@rc-component/dropdown
+[github-actions-image]: https://github.com/react-component/dropdown/actions/workflows/ci.yml/badge.svg
+[github-actions-url]: https://github.com/react-component/dropdown/actions/workflows/ci.yml
+[codecov-image]: https://img.shields.io/codecov/c/github/react-component/dropdown/master.svg?style=flat-square
+[codecov-url]: https://app.codecov.io/gh/react-component/dropdown
+[download-image]: https://img.shields.io/npm/dm/@rc-component/dropdown.svg?style=flat-square
+[download-url]: https://npmjs.org/package/@rc-component/dropdown
+[bundlephobia-image]: https://img.shields.io/bundlephobia/minzip/%40rc-component%2Fdropdown?style=flat-square
+[bundlephobia-url]: https://bundlephobia.com/package/@rc-component/dropdown
+[dumi-image]: https://img.shields.io/badge/docs%20by-dumi-blue?style=flat-square
+[dumi-url]: https://github.com/umijs/dumi
+
+## 特性
+
+- Built on `@rc-component/trigger`.
+- 支持 hover, click, context menu, and custom trigger actions.
+- Accepts a React element or render function as dropdown overlay.
+- 支持 align point behavior and trigger-width matching.
+
+## 安装
+
+```bash
+npm install @rc-component/dropdown
+```
+
+## 使用
+
+```tsx | pure
+import Dropdown from '@rc-component/dropdown';
+import '@rc-component/dropdown/assets/index.css';
+
+export default function App() {
+  return (
+    <Dropdown overlay={<div>Dropdown content</div>} trigger={['click']}>
+      <button type="button">Open</button>
+    </Dropdown>
+  );
+}
+```
+
+## 示例
+
+```bash
+npm install
+npm start
+```
+
+然后打开 `http://localhost:8000`。
+
+## API
+
+Additional props are passed to the underlying [`@rc-component/trigger`](https://github.com/react-component/trigger) component.
+
+| 参数 | 说明 | 类型 | 默认值 |
+| --- | --- | --- | --- |
+| alignPoint | Align popup to the click point | boolean | false |
+| animation | Popup animation name | string | - |
+| defaultVisible | Initial visible state | boolean | - |
+| getPopupContainer | Container where dropdown is rendered | `(node: HTMLElement) => HTMLElement` | `() => document.body` |
+| minOverlayWidthMatchTrigger | Whether overlay width should be at least trigger width | boolean | `true` unless `alignPoint` is set |
+| openClassName | Class name added to trigger when dropdown is open | string | `${prefixCls}-open` |
+| overlay | Dropdown overlay | `React.ReactElement \| (() => React.ReactElement)` | - |
+| overlayClassName | Additional overlay class name | string | - |
+| overlayStyle | Overlay style | `React.CSSProperties` | - |
+| placement | Dropdown placement | string | `bottomLeft` |
+| prefixCls | Component class name prefix | string | `rc-dropdown` |
+| transitionName | Popup transition class name | string | - |
+| trigger | Trigger action | `ActionType \| ActionType[]` | `['hover']` |
+| visible | Controlled visible state | boolean | - |
+| onOverlayClick | Callback when overlay is clicked | `(event: React.MouseEvent) => void` | - |
+| onVisibleChange | Callback when visibility changes | `(visible: boolean) => void` | - |
+
+## 本地开发
+
+```bash
+npm install
+npm start
+```
+
+```bash
+npm test
+npm run tsc
+npm run lint
+npm run compile
+npm run build
+```
+
+## 发布
+
+```bash
+npm run prepublishOnly
+```
+
+The release flow is handled by `@rc-component/np` through the `rc-np` command after the package build.
+
+## 许可证
+
+@rc-component/dropdown is released under the [MIT](./LICENSE) license.