manifest update

manifest.json

@@ -2,11 +2,13 @@
   "name": "IzControl Network Device Manager",
   "short_name": "IzControl",
   "lang": "hu",
-  "icons": [
-  {
-    "src": "homescreen.png"
-  }],
   "start_url": "/192.168.0.148",
   "display": "standalone",
-  "theme_color": "#979ea5"
+  "theme_color": "#979ea5",
+  "icons": [
+	  {
+	    "src": "homescreen.png",
+	    "sizes": "72x72 96x96 128x128 192x192 256x256"
+	  }
+	]
 }