add auth middleware, add page not found processing

src/router.js

@@ -1,9 +1,19 @@
 import Vue from 'vue';
 import Router from 'vue-router';
+import Store from '@/store';
+import NotFound from '@/views/Errors/NotFound';
 import Home from '@/views/Home';
 
 Vue.use(Router);
 
+function AuthMiddleware(from, to, next) {
+  if (Store.getters.isUserAuthentificated) {
+    next();
+  } else {
+    next('/sign_in');
+  }
+}
+
 export default new Router({
   routes: [
     {
@@ -25,6 +35,7 @@ export default new Router({
       path: '/profile',
       name: 'profile',
       component: () => import(/* webpackChunkName: "words" */ '@/views/Profile.vue'),
+      beforeEnter: AuthMiddleware,
     },
     {
       path: '/sign_in',
@@ -36,6 +47,10 @@ export default new Router({
       name: 'signUp',
       component: () => import(/* webpackChunkName: "sign_up" */ '@/views/SignUp.vue'),
     },
+    {
+      path: '*',
+      component: NotFound,
+    }
   ],
   mode: 'history',
 });