[Improvement] Reorganize document (#1066)

packages/slider/en-US.md

@@ -0,0 +1,66 @@
+## Slider
+
+### Install
+``` javascript
+import { Slider } from 'vant';
+
+Vue.use(Slider);
+```
+
+### Usage
+#### Basic Usage
+
+```html
+<van-slider v-model="value" @change="onChange" />
+```
+
+```js
+export default {
+  data() {
+    return {
+      value: 50
+    };
+  },
+
+  methods: {
+    onChange(value) {
+      this.$toast('Current value：' + value);
+    }
+  }
+};
+```
+
+#### Range
+
+```html
+<van-slider v-model="value" :min="10" :max="90" />
+```
+
+#### Disabled
+
+```html
+<van-slider v-model="value" disabled />
+```
+
+#### Step size
+
+```html
+<van-slider v-model="value" :step="10" bar-height="4px" />
+```
+
+### API
+
+| Attribute | Description | Type | Default |
+|-----------|-----------|-----------|-------------|-------------|
+| value | Current value | `Number` | `0` |
+| disabled | Whether to disable slider | `Boolean` | `false` |
+| max | Max value | `Number` | `100` |
+| min | Min value | `Number` | `0` |
+| step | Step size | `Number` | `1` |
+| bar-height | Height of bar | `String` | `2px` |
+
+### Event
+
+| Event | Description | Arguments |
+|-----------|-----------|-----------|
+| change | Triggered after value change | value: current rate |