diff --git a/Material_chrome.zip b/Material_chrome.zip
new file mode 100644
index 0000000..90f94e6
Binary files /dev/null and b/Material_chrome.zip differ
diff --git a/manifest.json b/manifest.json
new file mode 100644
index 0000000..70e0ef0
--- /dev/null
+++ b/manifest.json
@@ -0,0 +1,21 @@
+{
+  "name": "Materialverwaltung",
+  "short_name": "Materialverwaltung",
+  "start_url": "index.php",
+  "display": "standalone",
+  "background_color": "#ffffff",
+  "theme_color": "#2196f3",
+  "author": "M_Viper",
+  "icons": [
+    {
+      "src": "img/icon-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "img/icon-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ]
+}
diff --git a/service-worker.js b/service-worker.js
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index 0000000..88ec75f
--- /dev/null
+++ b/service-worker.js
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+// service-worker.js
+
+self.addEventListener('install', function(event) {
+  event.waitUntil(
+    caches.open('my-cache').then(function(cache) {
+      return cache.addAll([
+        'index.php',
+        'add_material_form.php',
+        'article_overview.php',
+        'check_expiration.php',
+        'css/style.css',
+        'img/favicon.png',
+        'img/Willkommen.png'
+      ]);
+    })
+  );
+});
+
+self.addEventListener('fetch', function(event) {
+  event.respondWith(
+    fetch(event.request).catch(function() {
+      return caches.match(event.request);
+    })
+  );
+});
+
+// Öffnen der Datenbankverbindung bei Bedarf
+function openDatabaseConnection() {
+  // Code zum Öffnen der Datenbankverbindung
+}
+
+// Schließen der Datenbankverbindung bei Bedarf
+function closeDatabaseConnection() {
+  // Code zum Schließen der Datenbankverbindung
+}
+
+// Events zum Öffnen und Schließen der Datenbankverbindung
+self.addEventListener('activate', function(event) {
+  openDatabaseConnection();
+});
+
+// Nachrichtenempfang vom Hauptthread (z.B. von der index.php)
+self.addEventListener('message', function(event) {
+  if (event.data.action === 'closeDatabaseConnection') {
+    closeDatabaseConnection();
+  }
+});