[Improvement] Reorganize document (#1066)

packages/number-keyboard/en-US.md

@@ -0,0 +1,84 @@
+## NumberKeyboard
+
+### Install
+``` javascript
+import { NumberKeyboard } from 'vant';
+
+Vue.use(NumberKeyboard);
+```
+
+### Usage
+
+#### Default Style
+
+```html
+<van-button @touchstart.native.stop="show = true">
+  Show Keyboard
+</van-button>
+
+<van-number-keyboard
+  :show="show"
+  extra-key="."
+  close-button-text="Close"
+  @blur="show = false"
+  @input="onInput"
+  @delete="onDelete"
+/>
+```
+
+```javascript
+export default {
+  data() {
+    return {
+      show: true
+    }
+  },
+
+  methods: {
+    onInput(value) {
+      Toast(value);
+    },
+    onDelete() {
+      Toast('delete');
+    }
+  }
+}
+```
+
+#### Custom Style
+
+```html
+<van-number-keyboard
+  :show="show"
+  theme="custom"
+  extra-key="."
+  close-button-text="Close"
+  @blur="show = false"
+  @input="onInput"
+  @delete="onDelete"
+/>
+```
+
+### API
+
+| Attribute | Description | Type | Default |
+|-----------|-----------|-----------|-------------|
+| show | Whether to show keyboard | `Boolean` | - |
+| theme | Keyboard theme，can be set to `default` `custom` | `String` | `default` |
+| title | Keyboard title | `String` | - |
+| transition | Whether to show transition animation | `Boolean` | `true` |
+| z-index | Keyboard z-index | `Number` | `100` |
+| extra-key | Content of bottom left key | `String` | `''` |
+| close-button-text | Close button text | `String` | `-` |
+| show-delete-key | Whether to show delete button | `Boolean` | `true` |
+| hide-on-click-outside | Whether to hide keyboard when click outside | `Boolean` | `true` |
+
+### Event
+
+| Event | Description | Arguments |
+|-----------|-----------|-----------|
+| input | Triggered when keydown | key: Content of the key |
+| delete | Triggered when press delete key | - |
+| blur | Triggered when blur keyboard | - |
+| show | Triggered when keyboard is fully displayed. | - |
+| hide | Triggered when keyboard is fully hidden. | - |