Add GPL modules

MediaBrowser.Controller/Sorting/IBaseItemComparer.cs

@@ -0,0 +1,17 @@
+using MediaBrowser.Controller.Entities;
+using System.Collections.Generic;
+
+namespace MediaBrowser.Controller.Sorting
+{
+    /// <summary>
+    /// Interface IBaseItemComparer
+    /// </summary>
+    public interface IBaseItemComparer : IComparer<BaseItem>
+    {
+        /// <summary>
+        /// Gets the name.
+        /// </summary>
+        /// <value>The name.</value>
+        string Name { get; }
+    }
+}