added URL scheme/deep linking

manifest.json

@@ -45,5 +45,41 @@
       "sizes": "1082x2402",
       "type": "image/png"
     }
+  ],
+  "url_handlers": [
+    {
+      "origin": "https://game-timer.virtonline.eu"
+    }
+  ],
+  "handle_links": "preferred",
+  "file_handlers": [],
+  "protocol_handlers": [
+    {
+      "protocol": "web+gametimer",
+      "url": "/?action=%s"
+    }
+  ],
+  "shortcuts": [
+    {
+      "name": "Start Game",
+      "short_name": "Start",
+      "description": "Start the game timer",
+      "url": "/?action=start",
+      "icons": [{ "src": "/icons/play.png", "sizes": "192x192" }]
+    },
+    {
+      "name": "Pause Game",
+      "short_name": "Pause",
+      "description": "Pause the game timer",
+      "url": "/?action=pause",
+      "icons": [{ "src": "/icons/pause.png", "sizes": "192x192" }]
+    },
+    {
+      "name": "Next Player",
+      "short_name": "Next",
+      "description": "Go to next player",
+      "url": "/?action=nextplayer",
+      "icons": [{ "src": "/icons/next.png", "sizes": "192x192" }]
+    }
   ]
 }