Add pwa manifest and icons

frontend/src/app.html

@@ -5,6 +5,8 @@
 	<meta charset="utf-8" />
 	<link rel="icon" href="%sveltekit.assets%/favicon.png" />
 	<meta name="viewport" content="width=device-width" />
+	<link rel="manifest" href="manifest.json" />
+
 	%sveltekit.head%
 </head>
 <style>

frontend/static/manifest.json

@@ -0,0 +1,52 @@
+{
+    "name": "PianelloExperience",
+    "short_name": "PianelloExperience",
+    "start_url": "/",
+    "display": "standalone",
+    "background_color": "#fff",
+    "description": "PianelloExperience",
+    "icons": [
+      {
+        "src": "images/app-icon-48x48.jpeg",
+        "sizes": "48x48",
+        "type": "image/jpeg"
+      },
+      {
+        "src": "images/app-icon-72x72.jpeg",
+        "sizes": "72x72",
+        "type": "image/jpeg"
+      },
+      {
+        "src": "images/app-icon-96x96.jpeg",
+        "sizes": "96x96",
+        "type": "image/jpeg"
+      },
+      {
+        "src": "images/app-icon-144x144.jpeg",
+        "sizes": "144x144",
+        "type": "image/jpeg"
+      },
+      {
+        "src": "images/app-icon-168x168.jpeg",
+        "sizes": "168x168",
+        "type": "image/jpeg"
+      },
+      {
+        "src": "images/app-icon-192x192.png",
+        "sizes": "192x192",
+        "type": "image/png"
+      },
+      {
+        "src": "images/app-icon-192x192.png",
+        "sizes": "512x512",
+        "type": "image/png"
+      }
+    ],
+    "related_applications": [
+      {
+        "platform": "play",
+        "url": "https://play.google.com/store/apps/details?id=cheeaun.hackerweb"
+      }
+    ]
+  }
+