Add project files.

Compat.Private.Serialization/Compat/Runtime/Serialization/ClassDataNode.cs

@@ -0,0 +1,26 @@
+using System.Collections.Generic;
+
+namespace Compat.Runtime.Serialization
+{
+    internal class ClassDataNode : DataNode<object>
+    {
+        private IList<ExtensionDataMember> _members;
+
+        internal ClassDataNode()
+        {
+            dataType = Globals.TypeOfClassDataNode;
+        }
+
+        internal IList<ExtensionDataMember> Members
+        {
+            get => _members;
+            set => _members = value;
+        }
+
+        public override void Clear()
+        {
+            base.Clear();
+            _members = null;
+        }
+    }
+}