add docs

README.md

@@ -129,7 +129,7 @@ yarn run lint
 - [ANTD 默认配置项](https://github.com/sendya/ant-design-pro-vue/blob/master/src/defaultSettings.js)
 - [按需加载/减少打包大小](https://github.com/sendya/ant-design-pro-vue/blob/master/docs/load-on-demand.md)  
 - [为首屏增加 Loading 动画](https://github.com/sendya/ant-design-pro-vue/blob/master/docs/add-page-loading-animate.md)
-- [多标签页组件 feature/multi-tabs](https://github.com/sendya/ant-design-pro-vue/tree/feature/multi-tabs)
+- [多标签页组件 feature/multi-tabs](https://github.com/sendya/ant-design-pro-vue/tree/feature/multi-tabs) [如何移除](https://github.com/sendya/ant-design-pro-vue/blob/master/docs/multi-tabs.md)
 - [按需加载用例 feature/demand_load](https://github.com/sendya/ant-design-pro-vue/tree/feature/demand_load)
 - [多语言使用案例 feature/lang](https://github.com/sendya/ant-design-pro-vue/tree/feature/lang) [@musnow](https://github.com/musnow) 提供
 - [为项目增加依赖项分析工具 analyzer](https://github.com/sendya/ant-design-pro-vue/blob/master/docs/webpack-bundle-analyzer.md)  

docs/multi-tabs.md

+多(页签)标签 模式
+====
+
+
+## 让框架支持打开的页面增加多标签，可随时切换
+
+### 关于如何移除该功能 组件
+  1. 移除 `/src/components/layouts/BasicLayout.vue` L3, L12, L19
+      ```vue
+      <multi-tab v-if="$store.getters.multiTab"></multi-tab>
+      ```
+  2. 移除 `/src/config/defaultSettings.js` L25
+
+  3. 移除 `src/store/modules/app.js` L27, L76-L79, L118-L120
+  
+  4. 移除 `src/utils/mixin.js` L21
+  
+  5. 删除组件目录 `src/components/MultiTab` 
+
+> 以上 `L x` 均代表行N ，如 L3 = 行3 
\ No newline at end of file