add BillApp

src/components/app/App.jsx

@@ -25,7 +25,7 @@ import {getCookie} from "../cookie";
 //案例入口
 import ShopApp from '../../case/shopApp/src/App'
 import OrderApp from '../../case/orderApp/src/App'
-
+import BillApp from '../../case/billApp/src/App'