Add GPL modules

MediaBrowser.Controller/Sync/ISyncProvider.cs

@@ -0,0 +1,27 @@
+using MediaBrowser.Model.Sync;
+using System.Collections.Generic;
+
+namespace MediaBrowser.Controller.Sync
+{
+    public interface ISyncProvider
+    {
+        /// <summary>
+        /// Gets the name.
+        /// </summary>
+        /// <value>The name.</value>
+        string Name { get; }
+
+        /// <summary>
+        /// Gets the synchronize targets.
+        /// </summary>
+        /// <param name="userId">The user identifier.</param>
+        /// <returns>IEnumerable&lt;SyncTarget&gt;.</returns>
+        List<SyncTarget> GetSyncTargets(string userId);
+
+        /// <summary>
+        /// Gets all synchronize targets.
+        /// </summary>
+        /// <returns>IEnumerable&lt;SyncTarget&gt;.</returns>
+        List<SyncTarget> GetAllSyncTargets();
+    }
+}