implement first dialog-, notification-, tray- and menu-api functions

ElectronNET.API/Electron.cs

@@ -21,5 +21,20 @@
         /// Create native application menus and context menus.
         /// </summary>
         public static Menu Menu { get { return Menu.Instance; } }
+
+        /// <summary>
+        /// Display native system dialogs for opening and saving files, alerting, etc.
+        /// </summary>
+        public static Dialog Dialog { get { return Dialog.Instance; } }
+
+        /// <summary>
+        /// Create OS desktop notifications
+        /// </summary>
+        public static Notification Notification { get { return Notification.Instance; } }
+
+        /// <summary>
+        /// Add icons and context menus to the system’s notification area.
+        /// </summary>
+        public static Tray Tray { get { return Tray.Instance; } }
     }
 }