Add code examples, and documentation

patterns/decorator/ShapeDecorations/Program.cs

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+#region
+
+using System;
+using ShapeDecorations.Shapes;
+using ShapeDecorations.Shapes.Decorators;
+
+#endregion
+
+namespace ShapeDecorations;
+
+internal class Program
+{
+   private static void Main(string[] args)
+   {
+      // scoped to allow for re-use of variable names
+      {
+         // First create a concrete shape, since we need one to be able to decorate anything
+         var circle = new Circle();
+         circle.Draw();
+
+         Console.WriteLine();
+
+         // Now we decorate the shape with a red color
+         var red = new RedColor(circle);
+         red.Draw();
+
+         Console.WriteLine();
+
+         // Since the decorator itself is an IShape, we can further decorate it
+         var blueBorder = new BlueBorder(red);
+         blueBorder.Draw();
+
+         Console.WriteLine();
+
+         // And can continue to decorate each ShapeDecorator with as many decorator classes as we like
+         var huge = new HugeSize(blueBorder);
+         huge.Draw();
+
+         Console.WriteLine();
+      }
+
+      {
+         // Always must start with a concrete IShape implementation
+         var rect = new Rectangle();
+         rect.Draw();
+
+         Console.WriteLine();
+
+         // Note that the order in which we decorate doesn't matter
+         var blueBorder = new BlueBorder(rect);
+         blueBorder.Draw();
+
+         Console.WriteLine();
+
+         var huge = new HugeSize(blueBorder);
+         huge.Draw();
+
+         Console.WriteLine();
+
+         var red = new RedColor(huge);
+         red.Draw();
+
+         Console.WriteLine();
+      }
+   }
+}