BasicUI: add webapp manifest and icons (#107)

Signed-off-by: Vlad Ivanov <vlad@ivanov.email>

bundles/org.openhab.ui.basicui/patch/web/manifest.json

@@ -0,0 +1,43 @@
+{
+	"name": "openHAB",
+	"icons": [
+		{
+			"src": "images/launcher-icon-0-75x.png",
+			"sizes": "36x36",
+			"type": "image/png",
+			"density": 0.75
+		},
+		{
+			"src": "images/launcher-icon-1x.png",
+			"sizes": "48x48",
+			"type": "image/png",
+			"density": 1.0
+		},
+		{
+			"src": "images/launcher-icon-1-5x.png",
+			"sizes": "72x72",
+			"type": "image/png",
+			"density": 1.5
+		},
+		{
+			"src": "images/launcher-icon-2x.png",
+			"sizes": "96x96",
+			"type": "image/png",
+			"density": 2.0
+		},
+		{
+			"src": "images/launcher-icon-3x.png",
+			"sizes": "144x144",
+			"type": "image/png",
+			"density": 3.0
+		},
+		{
+			"src": "images/launcher-icon-4x.png",
+			"sizes": "192x192",
+			"type": "image/png",
+			"density": 4.0
+		}
+	],
+	"start_url": "app",
+	"display": "standalone"
+}