Did a lot of work just unit testing left

Shapes/ImageManager.cs

@@ -0,0 +1,33 @@
+using System.Collections;
+using System.Drawing;
+using System.IO;
+
+namespace Shapes
+{
+    public static class ImageManager
+    {
+        private static Hashtable _images;
+        static ImageManager()
+        {
+            _images = new Hashtable();
+        }
+
+        internal static Bitmap GetImage(Stream stream)
+        {
+            if (_images.ContainsKey(stream))
+            {
+                return (Bitmap) _images[stream];
+            }
+            else
+            {
+               Bitmap bitmap = new Bitmap(stream);
+               _images.Add(stream, bitmap);
+               return bitmap;
+
+            }
+        }
+        
+        
+    }
+    
+}