feat(examples): 新增 Attachments 组件，支持文件上传和拖放功能，并更新路由配置

Author: weilei

examples/src/App.vue

@@ -6,8 +6,7 @@
             </el-header>
             <el-container>
                 <el-aside width="200px">
-                    <el-menu router :default-active="$route.path" background-color="#545c64" text-color="#fff"
-                        active-text-color="#ffd04b">
+                    <el-menu router :default-active="$route.path" background-color="#545c64" text-color="#fff" active-text-color="#ffd04b">
                         <el-menu-item index="/typewriter">
                             <i class="el-icon-edit"></i>
                             <span>Typewriter</span>
@@ -52,6 +51,10 @@
                             <i class="el-icon-edit"></i>
                             <span>FilesCard</span>
                         </el-menu-item>
+                        <el-menu-item index="/attachments">
+                            <i class="el-icon-edit"></i>
+                            <span>Attachments</span>
+                        </el-menu-item>
                     </el-menu>
                 </el-aside>
                 <el-main>

examples/src/router/index.js

@@ -11,6 +11,7 @@ import Think from '../views/Think.vue'
 import ThoughtChain from '../views/ThoughtChain.vue'
 import Sender from '../views/Sender.vue'
 import FilesCard from '../views/FilesCard.vue'
+import Attachments from '../views/Attachments.vue'
 Vue.use(Router)
 
 export default new Router({
@@ -70,6 +71,11 @@ export default new Router({
 			name: 'FilesCard',
 			component: FilesCard
 		},
+		{
+			path: '/attachments',
+			name: 'Attachments',
+			component: Attachments
+		},
 		{
 			path: '*',
 			redirect: '/typewriter'