added share target to web manifest

cookbook/templates/manifest.json

@@ -38,5 +38,14 @@
       "description": "View your shopping lists",
       "url": "./list/shopping-list/"
     }
-    ]
+  ],
+  "share_target": {
+    "action": "/data/import/url",
+    "method": "GET",
+    "params": {
+      "title": "title",
+      "text": "text",
+      "url": "url"
+    }
+  }
 }