[Improvement] Reorganize document (#1066)

packages/password-input/en-US.md

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+## PasswordInput
+The PasswordInput component is usually used with [NumberKeyboard](#/en-US/number-keyboard) Component.
+
+### Install
+``` javascript
+import { PasswordInput, NumberKeyboard } from 'vant';
+
+Vue.use(PasswordInput).use(NumberKeyboard);
+```
+
+### Usage
+
+#### Basic Usage
+
+```html
+<!-- PasswordInput -->
+<van-password-input
+  :value="value"
+  info="Some tips"
+  @focus="showKeyboard = true"
+/>
+
+<!-- NumberKeyboard -->
+<van-number-keyboard
+  :show="showKeyboard"
+  @input="onInput"
+  @delete="onDelete"
+  @blur="showKeyboard = false"
+/>
+```
+
+```javascript
+export default {
+  data() {
+    return {
+      value: '123',
+      showKeyboard: true
+    };
+  },
+
+  methods: {
+    onInput(key) {
+      this.value = (this.value + key).slice(0, 6);
+    },
+    onDelete() {
+      this.value = this.value.slice(0, this.value.length - 1);
+    }
+  }
+}
+```
+
+### API
+
+| Attribute | Description | Type | Default |
+|-----------|-----------|-----------|-------------|
+| value | Password value | `String` | `''` |
+| length | Maxlength of password | `Number` | `6` |
+| info | Bottom info | `String` | - |
+| error-info | Bottom error info | `String` | - |
+
+### Event
+
+| Event | Description | Arguments |
+|-----------|-----------|-----------|
+| focus | Triggered when input get focused | - |

packages/password-input/zh-CN.md

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+## PasswordInput 密码输入框
+密码输入框组件通常与 [数字键盘](#/zh-CN/number-keyboard) 组件配合使用
+
+### 使用指南
+``` javascript
+import { PasswordInput, NumberKeyboard } from 'vant';
+
+Vue.use(PasswordInput).use(NumberKeyboard);
+```
+
+### 代码演示
+
+#### 基础用法
+
+```html
+<!-- 密码输入框 -->
+<van-password-input
+  :value="value"
+  info="密码为 6 位数字"
+  @focus="showKeyboard = true"
+/>
+
+<!-- 数字键盘 -->
+<van-number-keyboard
+  :show="showKeyboard"
+  @input="onInput"
+  @delete="onDelete"
+  @blur="showKeyboard = false"
+/>
+```
+
+```javascript
+export default {
+  data() {
+    return {
+      value: '123',
+      showKeyboard: true
+    };
+  },
+
+  methods: {
+    onInput(key) {
+      this.value = (this.value + key).slice(0, 6);
+    },
+    onDelete() {
+      this.value = this.value.slice(0, this.value.length - 1);
+    }
+  }
+}
+```
+
+### API
+
+| 参数 | 说明 | 类型 | 默认值 |
+|-----------|-----------|-----------|-------------|
+| value | 密码值 | `String` | `''` |
+| length | 密码最大长度 | `Number` | `6` |
+| info | 输入框下方提示 | `String` | - |
+| error-info | 输入框下方错误提示 | `String` | - |
+
+### Event
+
+| 事件名 | 说明 | 参数 |
+|-----------|-----------|-----------|
+| focus | 输入框聚焦时触发 | - |