[Improvement] Reorganize document (#1066)

packages/tag/en-US.md

@@ -0,0 +1,51 @@
+## Tag
+
+### Install
+``` javascript
+import { Tag } from 'vant';
+
+Vue.use(Tag);
+```
+
+### Usage
+
+#### Basic Usage
+
+```html
+<van-tag>Tag</van-tag>
+<van-tag type="danger">Tag</van-tag>
+<van-tag type="success">Tag</van-tag>
+<van-tag type="primary">Tag</van-tag>
+```
+
+#### Plain style
+
+```html
+<van-tag plain>Tag</van-tag>
+<van-tag plain type="danger">Tag</van-tag>
+<van-tag plain type="primary">Tag</van-tag>
+<van-tag plain type="success">Tag</van-tag>
+```
+
+#### Mark style
+
+```html
+<van-tag mark>Tag</van-tag>
+<van-tag mark type="danger">Tag</van-tag>
+<van-tag mark type="primary">Tag</van-tag>
+<van-tag mark type="success">Tag</van-tag>
+```
+
+### API
+
+| Attribute | Description | Type | Default |
+|-----------|-----------|-----------|-------------|
+| type | Type, can be set to `primary` `success` `danger` | `String` | `''`|
+| plain | Whether to be plain style | `Boolean` | `false` |
+| mark | Wtether to be mark style | `Boolean` | `false` |
+
+### Slot
+
+| name | Description |
+|-----------|-----------|
+| - | Default slot |