manifest.json: add file

index.php

@@ -32,6 +32,7 @@ html_export_var(array(
   <meta charset="utf-8">
   <title>OpenStreetBrowser</title>
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <link rel="manifest" href="manifest.json" />
   <link rel="stylesheet" href="node_modules/leaflet/dist/leaflet.css" />
   <link rel="stylesheet" href="node_modules/font-awesome/css/font-awesome.min.css" />
   <link rel="stylesheet" href="node_modules/leaflet-geosearch/assets/css/leaflet.css" />

manifest.json

@@ -0,0 +1,14 @@
+{
+    "short_name": "OpenStreetBrowser",
+    "name": "OpenStreetBrowser",
+    "start_url": ".",
+    "background_color": "#ffffff",
+    "display": "browser",
+    "icons": [
+        {
+            "src": "img/osb-192.png",
+            "type": "image/png",
+            "sizes": "192x192"
+        }
+    ]
+}