started adding copay shell to copay

shell/lib/system-tray.js

@@ -0,0 +1,16 @@
+/*
+** copay-shell - system tray integration
+*/
+
+var Menu = require('menu');
+var Tray = require('tray');
+var tray = new Tray('../assets/copay.icns');
+
+module.exports = function(app, web) {
+
+  var menu = Menu.buildFromTemplate([]);
+
+  tray.setToolTip('Copay');
+  tray.setContextMenu(menu);
+
+};