Added IValue interface

Advanced Software Engineering/Advanced Software Engineering/Verbs/IValue.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Drawing;
+
+namespace Advanced_Software_Engineering.Verbs {
+
+    internal interface IValue {
+
+        string GetDescription();
+
+        int ToInt();
+
+        double ToDouble();
+
+        bool ToBool();
+
+        Color ToColor();
+
+        Type GetOriginalType();
+    }
+}