tree node traversal for folder

src/Core/Models/Domain/ITreeNodeObject.cs

@@ -0,0 +1,8 @@
+namespace Bit.Core.Models.Domain
+{
+    public interface ITreeNodeObject
+    {
+        string Id { get; set; }
+        string Name { get; set; }
+    }
+}

src/Core/Models/Domain/TreeNode.cs

@@ -0,0 +1,18 @@
+using System.Collections.Generic;
+
+namespace Bit.Core.Models.Domain
+{
+    public class TreeNode<T> where T : ITreeNodeObject
+    {
+        public T Parent { get; set; }
+        public T Node { get; set; }
+        public List<TreeNode<T>> Children { get; set; }
+
+        public TreeNode(T node, string name, T parent)
+        {
+            Parent = parent;
+            Node = node;
+            Node.Name = name;
+        }
+    }
+}

src/Core/Models/View/CollectionView.cs

@@ -2,7 +2,7 @@
 
 namespace Bit.Core.Models.View
 {
-    public class CollectionView : View
+    public class CollectionView : View, ITreeNodeObject
     {
         public CollectionView() { }
 

src/Core/Models/View/FolderView.cs

@@ -3,7 +3,7 @@ using System;
 
 namespace Bit.Core.Models.View
 {
-    public class FolderView : View
+    public class FolderView : View, ITreeNodeObject
     {
         public FolderView() { }