feat: add Empty component (#6010)

src/empty/README.md

@@ -0,0 +1,80 @@
+# Empty
+
+### Install
+
+```js
+import Vue from 'vue';
+import { Empty } from 'vant';
+
+Vue.use(Empty);
+```
+
+## Usage
+
+### Basic Usage
+
+```html
+<van-empty description="Description" />
+```
+
+### Image Type
+
+Use the image prop to display different placeholder images
+
+```html
+<!-- Error -->
+<van-empty image="error" description="Description" />
+<!-- Network -->
+<van-empty image="network" description="Description" />
+<!-- Search -->
+<van-empty image="search" description="Description" />
+```
+
+### Custom Image
+
+```html
+<van-empty
+  class="custom-image"
+  image="https://img.yzcdn.cn/vant/leaf.jpg"
+  description="Description"
+/>
+
+<style>
+.custom-image img {
+  border-radius: 100%;
+}
+</style>
+```
+
+### Bottom Content
+
+```html
+<van-empty description="Description">
+  <van-button round type="danger" class="bottom-button">
+    Button
+  </van-button>
+</van-empty>
+
+<style>
+.bottom-button {
+  width: 160px;
+}
+</style>
+```
+
+## API
+
+### Props
+
+| Attribute | Description | Type | Default |
+|------|------|------|------|
+| image | Image type，can be set to `error` `network` `search` or image URL | *string* | `default` |
+| description | Desciption | *string* | - |
+
+### Slots
+
+| Name | Description |
+|------|------|
+| default | Custom bottom content |
+| image | Custom image |
+| description | Custom description |