[Doc] add some english documents (#220)

* [bugfix] Checkbox border render error in weixin browser

* [bugfix] TreeSelect dependency path error

* [bugfix] Swipe should clear autoplay timer when destroyed

docs/examples-docs/en-US/cell.md

@@ -0,0 +1,105 @@
+<script>
+export default {
+  methods: {
+    handleClick() {
+      console.log('cell click');
+    }
+  }
+};
+</script>
+
+## Cell
+
+### Install
+``` javascript
+import { Cell, CellGroup } from 'vant';
+
+Vue.component(Cell.name, Cell);
+Vue.component(CellGroup.name, CellGroup);
+```
+
+### Usage
+
+#### Basic Usage
+
+:::demo Basic Usage
+```html
+<van-cell-group>
+  <van-cell title="Title" value="Text"></van-cell>
+  <van-cell title="Title" value="Text" label="Description"></van-cell>
+</van-cell-group>
+```
+:::
+
+#### Value only
+
+:::demo Value only
+```html
+<van-cell-group>
+  <van-cell value="Text"></van-cell>
+</van-cell-group>
+```
+:::
+
+#### Left Icon
+
+:::demo Left Icon
+```html
+<van-cell-group>
+  <van-cell title="Title" icon="location"></van-cell>
+</van-cell-group>
+```
+:::
+
+#### Link
+
+:::demo Link
+```html
+<van-cell-group>
+  <van-cell title="Title" is-link></van-cell>
+  <van-cell title="Title" is-link value="Text"></van-cell>
+</van-cell-group>
+```
+:::
+
+#### Advanced Usage
+
+:::demo Advanced Usage
+```html
+<van-cell-group>
+  <van-cell value="Text" icon="home" is-link>
+    <template slot="title">
+      <span class="van-cell-text">Title</span>
+      <van-tag type="danger">Tag</van-tag>
+    </template>
+  </van-cell>
+  <van-cell title="Title" icon="location" is-link></van-cell>
+  <van-cell title="Title">
+    <template slot="right-icon">
+      <van-icon name="search" class="van-cell__right-icon"></van-icon>
+    </template>
+  </van-cell>
+</van-cell-group>
+```
+:::
+
+### API
+
+| Attribute | Description | Type | Default | Accepted Values |
+|-----------|-----------|-----------|-------------|-------------|
+| icon | Left Icon | `String` | - | - |
+| title | Title | `String` | - | - |
+| value | Right text | `String` | - | - |
+| label | Description below the title | `String` | - | - |
+| url | Link | `String` | - | - |
+| isLink | Whether to show link icon | `Boolean` | `false` | - |
+| required | Whether to show required mark | `Boolean` | `false` | - |
+
+### Slot
+
+| name | Description |
+|-----------|-----------|
+| - | Default slot |
+| icon | Custom icon |
+| title | Custom title |
+| right-icon | Custom right icon |