Initial commit: English Course 10 with offline 3D assets

sw.js

@@ -0,0 +1,22 @@
+const CACHE_NAME = 'eng-game-v2';
+const ASSETS = [
+    './',
+    './index.html',
+    './data.js',
+    './manifest.json',
+    'https://cdn.tailwindcss.com',
+    'https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@24,400,1,0',
+    'https://fonts.googleapis.com/css2?family=Fredoka:wght@300;400;500;600;700&family=Comic+Neue:wght@400;700&family=Inter:wght@300;400;600;800&display=swap'
+];
+
+self.addEventListener('install', (e) => {
+    e.waitUntil(
+        caches.open(CACHE_NAME).then((cache) => cache.addAll(ASSETS))
+    );
+});
+
+self.addEventListener('fetch', (e) => {
+    e.respondWith(
+        caches.match(e.request).then((response) => response || fetch(e.request))
+    );
+});