added NotFound vue

src/router.ts

@@ -1,6 +1,7 @@
 import Vue from 'vue';
 import Router from 'vue-router';
 import Home from './views/Home.vue';
+import NotFound from './views/NotFound.vue';
 
 Vue.use(Router);
 
@@ -21,5 +22,10 @@ export default new Router({
       // which is lazy-loaded when the route is visited.
       component: () => import(/* webpackChunkName: "about" */ './views/About.vue'),
     },
+    {
+      path: '*',
+      name: 'notFound',
+      component: NotFound,
+    }
   ],
 });