Add code examples, and documentation

patterns/state/WithStatePattern/States/Stopped.cs

@@ -0,0 +1,27 @@
+namespace WithStatePattern.States;
+
+public class Stopped : State
+{
+   public Stopped(Car car)
+      : base(car) { }
+
+   public override void PressGas()
+   {
+      Console.WriteLine("The car begins to drive");
+      Console.WriteLine();
+      _car.ChangeState(new Driving(_car));
+   }
+
+   public override void TurnKeyClockwise()
+   {
+      Console.WriteLine("You hear a grinding noise...");
+      Console.WriteLine();
+   }
+
+   public override void TurnKeyCounterClockwise()
+   {
+      Console.WriteLine("The engine has stopped");
+      Console.WriteLine();
+      _car.ChangeState(new Off(_car));
+   }
+}