[breaking change] Badge: rename to sidebar

packages/sidebar/en-US.md

@@ -0,0 +1,67 @@
+## Sidebar
+
+### Install
+
+``` javascript
+import { Sidebar, SidebarItem } from 'vant';
+
+Vue.use(Sidebar);
+Vue.use(SidebarItem);
+```
+
+### Usage
+
+#### Basic Usage
+
+Use `active-key` prop to set index of chosen item
+
+```html
+<van-sidebar :active-key="activeKey" @change="onChange">
+  <van-sidebar-item title="Title" />
+  <van-sidebar-item title="Title" info="8" />
+  <van-sidebar-item title="Title" info="99" />
+  <van-sidebar-item title="Title" info="99+" />
+</van-sidebar>
+```
+
+``` javascript
+export default {
+  data() {
+    return {
+      activeKey: 0
+    };
+  },
+
+  methods: {
+    onChange(key) {
+      this.activeKey = key;
+    }
+  }
+};
+```
+
+### Sidebar API
+
+| Attribute | Description | Type | Default |
+|------|------|------|------|
+| active-key | Index of chosen item | `String | Number` | `0` |
+
+### Sidebar Event
+
+| Event | Description | Arguments |
+|------|------|------|
+| change | Triggered when item changed | key: index of current item |
+
+### SidebarItem API
+
+| Attribute | Description | Type | Default |
+|------|------|------|------|
+| title | Content | `String` | `''` |
+| info | Info Message | `String | Number` | `''` |
+| url | Link | `String` | - |
+
+### SidebarItem Event
+
+| Event | Description | Arguments |
+|------|------|------|
+| click | Triggered when click item | key: index of current item |