add webmanifest

public/manifest.json

@@ -0,0 +1,19 @@
+{
+  "name": "Teacup",
+  "short_name": "Teacup",
+  "icons": [
+    {
+      "src": "/images/teacup-icon-144.png",
+      "sizes": "144x144",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/teacup-icon-57.png",
+      "sizes": "57x57",
+      "type": "image/png"
+    }
+  ],
+  "theme_color": "#ffffff",
+  "background_color": "#ffffff",
+  "display": "standalone"
+}

views/layout.php

@@ -26,6 +26,8 @@
     <link rel="apple-touch-icon" sizes="114x114" href="/images/teacup-icon-114.png">
     <link rel="apple-touch-icon" sizes="144x144" href="/images/teacup-icon-144.png">
 
+    <link rel="manifest" href="/manifest.json">
+
     <link rel="icon" href="/images/teacup-16px.png" type="image/png">
 
     <script src="/js/jquery-1.7.1.min.js"></script>
@@ -66,4 +68,4 @@
 </div>
 
 </body>
-</html>
+</html>