docs: update readme

README.md

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-# uni-helper/unocss-preset-uni
+# @uni-helper/unocss-preset-uni
+
+专为 uni-app 打造的 UnoCSS 预设
+
+[![npm version][npm-version-src]][npm-version-href]
+[![npm downloads][npm-downloads-src]][npm-downloads-href]
+[![bundle][bundle-src]][bundle-href]
+[![License][license-src]][license-href]
+
+## 特性
+
+- ⚡️ 零配置启动，就像 `presetUno` 一样！
+- 👍 内置 `Attributify` 支持！
+- ⚙️ 随时停用或自定义预设的配置
+- 🦾 按平台编写样式！
+
+## 使用
+
+安装
+
+```shell
+pnpm add @uni-helper/unocss-preset-uni
+```
+配置
+
+```ts
+// uno.config.ts
+import { defineConfig } from 'unocss'
+import presetUni from '@uni-helper/unocss-preset-uni'
+
+export default defineConfig({
+  presets: [
+    presetUni()
+  ]
+})
+```
+
+## 示例
+
+### 按平台编写
+
+```html
+<div class='uni-h5:mx-auto'></div>
+<div class='uni-app:mx-auto'></div>
+<div class='uni-app-android:mx-auto'></div>
+<div class='uni-mp:mx-auto'></div>
+<div class='uni-mp-weixin:mx-auto'></div>
+...
+```
+
+你还可以使用 uno.config 的 theme 来自定义平台匹配规则:
+
+```ts
+export default defineConfig({
+  theme: {
+    platform: {
+      'wechat': 'mp-weixin', // alias 到 mp-weixin
+      'my-app': 'my-app', // 自定义平台
+    }
+  }
+})
+```
+```html
+<div class='uni-wechat:mx-auto'></div>
+<div class='uni-my-app:mx-auto'></div>
+```
+
+## 感谢
+
+- [unocss](https://github.com/unocss/unocss.git) 提供大部分函数
+- [unocss-applet](https://github.com/unocss-applet/unocss-applet.git) 提供小程序支持
+- [uni-unocss](https://github.com/okxiaoliang4/uni-unocss) 提供按平台编写灵感
+
+<!-- Badges -->
+
+[npm-version-src]: https://img.shields.io/npm/v/@uni-helper/unocss-preset-uni?style=flat&colorA=18181B&colorB=F0DB4F
+[npm-version-href]: https://npmjs.com/package/@uni-helper/unocss-preset-uni
+[npm-downloads-src]: https://img.shields.io/npm/dm/@uni-helper/unocss-preset-uni?style=flat&colorA=18181B&colorB=F0DB4F
+[npm-downloads-href]: https://npmjs.com/package/@uni-helper/unocss-preset-uni
+[bundle-src]: https://img.shields.io/bundlephobia/minzip/@uni-helper/unocss-preset-uni?style=flat&colorA=18181B&colorB=F0DB4F
+[bundle-href]: https://bundlephobia.com/result?p=@uni-helper/unocss-preset-uni
+[license-src]: https://img.shields.io/github/license/uni-helper/unocss-preset-uni.svg?style=flat&colorA=18181B&colorB=F0DB4F
+[license-href]: https://github.com/uni-helper/unocss-preset-uni/blob/main/LICENSE