First commit.

Source/OpenNest.Engine/RectanglePacking/PackEngine.cs

@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+
+namespace OpenNest.RectanglePacking
+{
+    internal abstract class PackEngine
+    {
+        public PackEngine(Bin bin)
+        {
+            Bin = bin;
+        }
+
+        public Bin Bin { get; set; }
+
+        public abstract void Pack(List<Item> items);
+    }
+}