Add project files.

Compat.Private.Serialization/Compat/Runtime/Serialization/ExportOptions.cs

@@ -0,0 +1,38 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+using System;
+using System.Collections.ObjectModel;
+
+namespace Compat.Runtime.Serialization
+{
+    public class ExportOptions
+    {
+        private Collection<Type> knownTypes;
+        private IDataContractSurrogate dataContractSurrogate;
+
+        public IDataContractSurrogate DataContractSurrogate
+        {
+            get => dataContractSurrogate;
+            set => dataContractSurrogate = value;
+        }
+
+        internal IDataContractSurrogate GetSurrogate()
+        {
+            return dataContractSurrogate;
+        }
+
+        public Collection<Type> KnownTypes
+        {
+            get
+            {
+                if (knownTypes == null)
+                {
+                    knownTypes = new Collection<Type>();
+                }
+                return knownTypes;
+            }
+        }
+    }
+}
+