[Doc] rename component README file (#3662)

src/notice-bar/README.md

@@ -0,0 +1,91 @@
+# NoticeBar
+
+### Install
+
+``` javascript
+import { NoticeBar } from 'vant';
+
+Vue.use(NoticeBar);
+```
+
+## Usage
+
+### Basic Usage
+
+```html
+<van-notice-bar
+  text="Notice Content"
+  left-icon="volume-o"
+/>
+```
+
+### Disable scroll
+
+```html
+<van-notice-bar :scrollable="false">
+  Notice Content
+</van-notice-bar>
+```
+
+### Wrapable
+
+```html
+<van-notice-bar wrapable :scrollable="false">
+  Notice Content
+</van-notice-bar>
+```
+
+### Mode
+
+```html
+<van-notice-bar mode="closeable">
+  Notice Content
+</van-notice-bar>
+
+<van-notice-bar mode="link">
+  Notice Content
+</van-notice-bar>
+```
+
+### Custom Style
+
+```html
+<van-notice-bar
+  color="#1989fa"
+  background="#ecf9ff"
+  left-icon="info-o"
+>
+  Notice Content
+</van-notice-bar>
+```
+
+## API
+
+### Props
+
+| Attribute | Description | Type | Default |
+|------|------|------|------|
+| mode | Mode, can be set to `closeable` `link` | `String` | `''` |
+| text | Notice text content | `String` | `''` | - |
+| delay | Animation delay (s) | `Number` | `1` |
+| speed | Scroll speed (px/s) | `Number` | `50` |
+| scrollable | Whether to scroll content | `Boolean` | `true` |
+| wrapable | Whether to enable text wrap | `Boolean` | `false` | - |
+| left-icon | Left Icon | `String` | - |
+| color | Text color | `String` | `#f60` |
+| background | Background color | `String` | `#fff7cc` |
+
+### Events
+
+| Event | Description | Arguments |
+|------|------|------|
+| click | Triggered when click NoticeBar | - |
+| close | Triggered when closed | - |
+
+### Slots
+
+| Name | Description |
+|------|------|
+| default | Notice text content |
+| left-icon | Custom left icon |
+| right-icon | Custom right icon |