[Improvement] Reorganize document (#1066)

packages/popup/en-US.md

@@ -0,0 +1,56 @@
+## Popup
+
+### Install
+``` javascript
+import { Popup } from 'vant';
+
+Vue.use(Popup);
+```
+
+### Usage
+
+#### Basic Usage
+Popup is located in the middle of the screen by default
+
+```html
+<van-popup v-model="show">Content</van-popup>
+```
+
+```javascript
+export default {
+  data() {
+    return {
+      show: false
+    }
+  }
+};
+```
+
+#### Position
+Use `position` prop to set popup display position
+
+```html
+<van-popup v-model="show" position="top" :overlay="false">
+  Content
+</van-popup>
+```
+
+### API
+
+| Attribute | Description | Type | Default |
+|-----------|-----------|-----------|-------------|
+| v-model | Whether to show popup | `Boolean` | `false` |
+| overlay | Whether to show overlay | `Boolean` | `true` |
+| position | Can be set to `top` `bottom` `right` `left` | `String` | - |
+| overlay-class | Custom overlay class | `String` | `` |
+| overlay-style | Custom overlay style | `Object` | - |
+| close-on-click-overlay | Close popup when click overlay | `Boolean` | `true` |
+| transition | Transition | `String` | `popup-slide` |
+| lock-scroll | Whether to lock background scroll | `Boolean` | `true` |
+| get-container | Return the mount node for Popup | `() => HTMLElement` | - |
+
+### Event
+
+| Event | Description | Arguments |
+|-----------|-----------|-----------|
+| click-overlay | Triggered when click overlay | - |