diff --git a/service-worker.js b/service-worker.js
new file mode 100644
index 0000000..e2f0048
--- /dev/null
+++ b/service-worker.js
@@ -0,0 +1,17 @@
+self.addEventListener('fetch', event=> {
+    let response=fetch(event.request);
+    event.respondWith(response);
+});
+
+let deferredPrompt;
+
+self.addEventListener('beforeinstallprompt', (e) => {
+  // Prevent Chrome 67 and earlier from automatically showing the prompt
+  e.preventDefault();
+  // Stash the event so it can be triggered later.
+  deferredPrompt = e;
+});
+
+self.addEventListener('appinstalled', (evt) => {
+  console.log('a2hs installed');
+});