[Doc] rename component README file (#3662)

src/stepper/README.md

@@ -0,0 +1,109 @@
+# Stepper
+
+### Install
+
+``` javascript
+import { Stepper } from 'vant';
+
+Vue.use(Stepper);
+```
+
+## Usage
+
+### Basic Usage
+
+```html
+<van-stepper v-model="value" />
+```
+
+```javascript
+export default {
+  data() {
+    return {
+      value: 1
+    }
+  }
+}
+```
+
+### Step
+
+```html
+<van-stepper v-model="value" step="2" />
+```
+
+### Range
+
+```html
+<van-stepper v-model="value" min="5" max="8" />
+```
+
+### Integer
+
+```html
+<van-stepper v-model="value" integer />
+```
+
+### Disabled
+
+```html
+<van-stepper v-model="value" disabled />
+```
+
+### Async Change
+
+```html
+<van-stepper
+  :value="value"
+  async-change
+  @change="onChange"
+/>
+```
+
+```javascript
+export default {
+  data() {
+    return {
+      value: 1
+    }
+  },
+
+  methods: {
+    onChange(value) {
+      Toast.loading({ forbidClick: true });
+
+      setTimeout(() => {
+        Toast.claer();
+        this.value = value;
+      }, 500);
+    }
+  }
+}
+```
+
+## API
+
+### Props
+
+| Attribute | Description | Type | Default |
+|------|------|------|------|
+| v-model | Current value | `String | Number` | Min value |
+| min | Min value | `String | Number` | `1` |
+| max | Max value | `String | Number` | - |
+| step | Value change step | `String | Number` | `1` |
+| integer | Whether to allow only integers | `Boolean` | `false` |
+| disabled | Disable value change | `Boolean` | `false` |
+| disable-input | Disable input | `Boolean` | `false` |
+| async-change | Whether to enable async change | `Boolean` | `false` | - |
+| input-width | Input width | `String | Number` | `30px` |
+
+### Events
+
+| Event | Description | Arguments |
+|------|------|------|
+| change | Triggered when value change | value: current value |
+| overlimit | Triggered when click disabled button | - |
+| plus | Triggered when click plus button | - |
+| minus | Triggered when click minus button | - |
+| focus | Triggered when input focused | - |
+| blur | Triggered when input blured | - |