[Improvement] Reorganize document (#1066)

packages/steps/en-US.md

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+## Steps
+
+### Install
+``` javascript
+import { Step, Steps } from 'vant';
+
+Vue.use(Step).use(Steps);
+```
+
+### Usage
+
+#### Basic Usage
+
+```html
+<van-steps :active="active">
+  <van-step>Step1</van-step>
+  <van-step>Step2</van-step>
+  <van-step>Step3</van-step>
+  <van-step>Step4</van-step>
+</van-steps>
+```
+
+```javascript
+export default {
+  data() {
+    return {
+      active: 1
+    };
+  }
+}
+```
+
+#### Description
+
+```html
+<van-steps
+  :active="active"
+  icon="logistics"
+  title="Title"
+  description="Description"
+>
+  <van-step>Step1</van-step>
+  <van-step>Step2</van-step>
+  <van-step>Step3</van-step>
+  <van-step>Step4</van-step>
+</van-steps>
+```
+
+#### Vertical Steps
+
+```html
+<van-steps direction="vertical" :active="0" active-color="#f60">
+  <van-step>
+    <h3>【City】Status1</h3>
+    <p>2016-07-12 12:40</p>
+  </van-step>
+  <van-step>
+    <h3>【City】Status2</h3>
+    <p>2016-07-11 10:00</p>
+  </van-step>
+  <van-step>
+    <h3>【City】Status3</h3>
+    <p>2016-07-10 09:30</p>
+  </van-step>
+</van-steps>
+```
+
+### Steps API
+
+| Attribute | Description | Type | Default |
+|-----------|-----------|-----------|-------------|
+| active | Active step | `Number` | 0 |
+| icon | Action step icon | `String` | - |
+| icon-class | Icon class | `String` | - |
+| title | Title | `String` | - |
+| description | Description | `String` | - |
+| direction | Can be set to `horizontal` `vertical` | `String` | `horizontal` |
+| active-color | Active step color | `String` | `#06bf04` |
+
+### Steps Slot
+
+| Name | Description |
+|-----------|-----------|
+| icon | Custom icon |
+| message-extra | Extra content |

packages/steps/zh-CN.md

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+## Steps 步骤条
+
+### 使用指南
+``` javascript
+import { Step, Steps } from 'vant';
+
+Vue.use(Step).use(Steps);
+```
+
+### 代码演示
+
+#### 基础用法
+
+```html
+<van-steps :active="active">
+  <van-step>买家下单</van-step>
+  <van-step>商家接单</van-step>
+  <van-step>买家提货</van-step>
+  <van-step>交易完成</van-step>
+</van-steps>
+```
+
+```javascript
+export default {
+  data() {
+    return {
+      active: 1
+    };
+  }
+}
+```
+
+#### 描述信息
+
+通过`title`和`description`属性来定义描述信息信息
+
+```html
+<van-steps
+  :active="active"
+  icon="logistics"
+  title="标题"
+  description="描述信息"
+>
+  <van-step>买家下单</van-step>
+  <van-step>商家接单</van-step>
+  <van-step>买家提货</van-step>
+  <van-step>交易完成</van-step>
+</van-steps>
+```
+
+#### 竖向步骤条
+可以通过设置`direction`属性来改变步骤条的显示方式
+
+```html
+<van-steps direction="vertical" :active="0" active-color="#f60">
+  <van-step>
+    <h3>【城市】物流状态1</h3>
+    <p>2016-07-12 12:40</p>
+  </van-step>
+  <van-step>
+    <h3>【城市】物流状态2</h3>
+    <p>2016-07-11 10:00</p>
+  </van-step>
+  <van-step>
+    <h3>快件已发货</h3>
+    <p>2016-07-10 09:30</p>
+  </van-step>
+</van-steps>
+```
+
+### Steps API
+
+| 参数 | 说明 | 类型 | 默认值 |
+|-----------|-----------|-----------|-------------|
+| active | 当前步骤 | `Number` | 0 |
+| title | 描述栏标题 | `String` | - |
+| description | 描述栏文字 | `String` | - |
+| icon | 描述栏图标 | `String` | - |
+| icon-class | 图标额外类名 | `String` | - |
+| direction | 显示方向，可选值为 `horizontal` `vertical` | `String` | `horizontal` |
+| active-color | 激活状态颜色 | `String` | `#06bf04` |
+
+### Steps Slot
+
+| Name | 说明 |
+|-----------|-----------|
+| icon | 自定义icon区域 |
+| message-extra | 状态栏添加额外的元素 |