Add minimal PWA (#34)

src/ServiceWorker/sw.js

@@ -0,0 +1,4 @@
+/* eslint-disable no-console */
+
+console.log('Hello from the service worker');
+

src/main.js

@@ -87,6 +87,9 @@ Vue.component('icon', FontAwesomeIcon)
 import VTooltip from 'v-tooltip'
 Vue.use(VTooltip)
 
+// PWA
+import './registerServiceWorker'
+
 // Set focus
 Vue.directive('focus', {
 	// When the bound element is inserted into the DOM...

src/registerServiceWorker.js

@@ -0,0 +1,31 @@
+/* eslint-disable no-console */
+
+import { register } from 'register-service-worker'
+
+if (process.env.NODE_ENV === 'production') {
+  register(`${process.env.BASE_URL}sw.js`, {
+    ready () {
+      console.log(
+        'App is being served from cache by a service worker.'
+      )
+    },
+    registered () {
+      console.log('Service worker has been registered.')
+    },
+    cached () {
+      console.log('Content has been cached for offline use.')
+    },
+    updatefound () {
+      console.log('New content is downloading.')
+    },
+    updated () {
+      console.log('New content is available; please refresh.')
+    },
+    offline () {
+      console.log('No internet connection found. App is running in offline mode.')
+    },
+    error (error) {
+      console.error('Error during service worker registration:', error)
+    }
+  })
+}