Implements doc type collections

src/Umbraco.Web/Models/ContentEditing/DocumentTypeCollectionDisplay.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Umbraco.Web.Models.ContentEditing
+{
+    public class DocumentTypeCollectionDisplay
+    {
+        public int CollectionId { get; set; }
+        public int ItemId { get; set; }
+    }
+}