Add GPL modules

MediaBrowser.Controller/Notifications/INotificationService.cs

@@ -0,0 +1,30 @@
+using MediaBrowser.Controller.Entities;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Controller.Notifications
+{
+    public interface INotificationService
+    {
+        /// <summary>
+        /// Gets the name.
+        /// </summary>
+        /// <value>The name.</value>
+        string Name { get; }
+
+        /// <summary>
+        /// Sends the notification.
+        /// </summary>
+        /// <param name="request">The request.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        Task SendNotification(UserNotification request, CancellationToken cancellationToken);
+
+        /// <summary>
+        /// Determines whether [is enabled for user] [the specified user identifier].
+        /// </summary>
+        /// <param name="user">The user.</param>
+        /// <returns><c>true</c> if [is enabled for user] [the specified user identifier]; otherwise, <c>false</c>.</returns>
+        bool IsEnabledForUser(User user);
+    }
+}