[Improvement] Reorganize document (#1066)

packages/uploader/en-US.md

@@ -0,0 +1,68 @@
+## Uploader
+
+### Install
+``` javascript
+import { Uploader } from 'vant';
+
+Vue.use(Uploader);
+```
+
+### Usage
+
+#### Basic Usage
+
+```html
+<div class="uploader-container">
+  <van-uploader :after-read="onRead">
+    <van-icon name="photograph" />
+  </van-uploader>
+</div>
+```
+
+```javascript
+export default {
+  methods: {
+    onRead(file) {
+      console.log(file)
+    }
+  }
+};
+```
+
+#### Set input attr
+You can set native properties such as `accpet`、`multiple` on Uploader, and the input will automatically inherits the attribute.
+
+```html
+<van-uploader :after-read="onRead" accept="image/gif, image/jpeg" multiple>
+  <van-icon name="photograph" />
+</van-uploader>
+```
+
+### API
+
+| Attribute | Description | Type | Default |
+|-----------|-----------|-----------|-------------|
+| result-type | Type of file read result, can be set to `dataUrl` `text` | `String` | `dataUrl` |
+| accept | Accepted file type | `String` | `image/*` |
+| disabled | Whether to disabled the upload | `Boolean` | `false` |
+| before-read | Hook before reading the file, return false to stop reading the file | `Function` | - |
+| after-read | Hook after reading the file | `Function` | - |
+| max-size | Max size of file | `Number` | - |
+
+### Event
+
+| Event | Description | Arguments |
+|-----------|-----------|-----------|
+| oversize | Triggered when file size over limit | Same as after-read |
+
+### Slot
+
+| Name | Description |
+|-----------|-----------|
+| - | Custom icon |
+
+### afterRead parematers
+| Key | Description | Type |
+|-----------|-----------|-----------|
+| file | file object | `Object` |
+| content | file content | `String` |