Add code examples, and documentation

patterns/facade/CarEngineFacade/Program.cs

@@ -0,0 +1,38 @@
+namespace CarEngineFacade;
+
+internal class Program
+{
+   private static void Main(string[] args)
+   {
+      //// without the facade, starting the engine involves creating all the objects
+      //var airflow = new AirFlowController();
+      //var fuel = new FuelInjector();
+      //var start = new Starter();
+      //var cool = new CoolingController();
+      //var cat = new CatalyticConverter();
+
+      //// then performing all the steps in the correct order
+      //airflow.TakeAir();
+      //fuel.On();
+      //fuel.Inject();
+      //start.Start();
+      //cool.Run();
+      //cat.On();
+
+      //// and shut down also requires steps in the correct order
+      //fuel.Off();
+      //cat.Off();
+      //cool.Cool();
+      //cool.Stop();
+      //airflow.Off();
+
+      // with the Facade, all creation is handled internally
+      var facade = new Facade();
+
+      // as is starting
+      facade.Start();
+
+      // and stopping
+      facade.Stop();
+   }
+}