Create service-worker.js

service-worker.js

@@ -0,0 +1,21 @@
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open('mobile-simulator-cache').then((cache) => {
+      return cache.addAll([
+        '/',
+        '/index.html',
+        '/manifest.json',
+        '/favicon.ico',
+        '/style.css'
+      ]);
+    })
+  );
+});
+
+self.addEventListener('fetch', (event) => {
+  event.respondWith(
+    caches.match(event.request).then((cachedResponse) => {
+      return cachedResponse || fetch(event.request);
+    })
+  );
+});