add webapp, move frontend to webapp folder

webapp/frontend/src/router/index.js

@@ -0,0 +1,15 @@
+import { createRouter, createWebHistory } from 'vue-router'
+import HomeView from '../views/HomeView.vue'
+
+const router = createRouter({
+  history: createWebHistory(import.meta.env.BASE_URL),
+  routes: [
+    {
+      path: '/',
+      name: 'home',
+      component: HomeView,
+    },
+  ],
+})
+
+export default router