[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/switch-cell.md

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+## SwitchCell
+
+`SwitchCell`组件是对`Switch`和`Cell`组件的封装
+
+<script>
+export default {
+  data() {
+    return {
+      checked: true
+    }
+  }
+}
+</script>
+
+### Install
+``` javascript
+import { SwitchCell } from 'vant';
+
+Vue.component(SwitchCell.name, SwitchCell);
+```
+
+### Usage
+
+#### Basic Usage
+
+:::demo Basic Usage
+```html
+<van-cell-group>
+  <van-switch-cell v-model="checked" title="标题" />
+</van-cell-group>
+```
+
+```javascript
+export default {
+  data() {
+    return {
+      checked: true
+    }
+  }
+}
+```
+:::
+
+#### Disabled
+通过`disabled`属性可以将组件设置为禁用状态
+
+:::demo 禁用状态
+```html
+<van-cell-group>
+  <van-switch-cell v-model="checked" :disabled="true" title="标题" />
+</van-cell-group>
+```
+:::
+
+#### Loading
+通过`loading`属性可以将组件设置为加载状态
+
+:::demo 加载状态
+```html
+<van-cell-group>
+  <van-switch-cell v-model="checked" :loading="true" title="标题" />
+</van-cell-group>
+```
+:::
+
+### API
+
+| Attribute | Description | Type | Default | Accepted Values |
+|-----------|-----------|-----------|-------------|-------------|
+| v-model | 开关状态 | `Boolean` | | |
+| title | 左侧标题 |  `String` | `''` | |
+| loading | 是否为加载状态 |  `Boolean` | `false` | |
+| disabled | 是否为禁用状态 |  `Boolean` | `false` | |
+
+### Event
+
+| Event | Description | Attribute |
+|-----------|-----------|-----------|
+| change | 开关状态切换回调 | checked: 是否选中开关 |