add missing sourcecode

src/router/index.js

@@ -0,0 +1,31 @@
+import Vue from 'vue'
+import VueRouter from 'vue-router'
+import Home from '../views/Home.vue'
+import Warning from '../views/Warning'
+import Questionnaire from "@/views/Questionnaire";
+
+Vue.use(VueRouter)
+
+const routes = [
+  {
+    path: '/',
+    name: 'Home',
+    component: Home
+  },
+  {
+    path: '/warning',
+    name: 'Warnung',
+    component: Warning
+  },
+  {
+    path: '/questionmaire',
+    name: 'Fragebogen',
+    component: Questionnaire
+  }
+]
+
+const router = new VueRouter({
+  routes
+})
+
+export default router