Did a lot of work just unit testing left

Shapes/FileIO.cs

@@ -0,0 +1,27 @@
+using System;
+using System.IO;
+using System.Runtime.CompilerServices;
+using System.Runtime.Serialization.Json;
+using System.Xml.Serialization;
+using static System.Runtime.Serialization.Json.JsonReaderWriterFactory;
+
+namespace Shapes
+{
+    public class FileIO
+    {
+        public void SaveShape(Stream stream, Shape shape)
+        {
+            DataContractJsonSerializer a = new DataContractJsonSerializer(typeof(Shape));
+            a.WriteObject(stream, shape);
+//            DataContractJsonSerializer j = new DataContractJsonSerializer(typeof(Shape));
+//            j.WriteObject(stream, shape);
+        }
+
+        public T GetShapeFromFile<T>(Stream stream)
+        {
+            var a = new DataContractJsonSerializer(typeof(T));
+            return  (T) a.ReadObject(stream);
+        }
+        
+    }
+}