added Armband dummy

SketchAssistant/SketchAssistantWPF/Armband.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace SketchAssistantWPF
+{
+    internal class Armband
+    {
+        internal void pushForward()
+        {
+            Console.WriteLine("FORWARD_PUSH");
+        }
+
+        internal void pushBackward()
+        {
+            Console.WriteLine("BACKWARD_PUSH");
+        }
+    }
+}