Add GPL modules

MediaBrowser.Controller/Entities/ICollectionFolder.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace MediaBrowser.Controller.Entities
+{
+    /// <summary>
+    /// This is just a marker interface to denote top level folders
+    /// </summary>
+    public interface ICollectionFolder : IHasCollectionType
+    {
+        string Path { get; }
+        string Name { get; }
+        Guid Id { get; }
+        string[] PhysicalLocations { get; }
+    }
+
+    public interface ISupportsUserSpecificView
+    {
+        bool EnableUserSpecificView { get; }
+    }
+
+    public interface IHasCollectionType
+    {
+        string CollectionType { get; }
+    }
+}