Add code examples, and documentation

patterns/state/CarState/States/Driving.cs

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+#region
+
+using System;
+
+#endregion
+
+namespace CarState.States;
+
+public class Driving : State
+{
+   public Driving(Car car)
+      : base(car) { }
+
+   public override void TurnKeyClockwise()
+   {
+      Console.WriteLine("You hear a grinding noise...");
+      Console.WriteLine();
+   }
+
+   public override void TurnKeyCounterClockwise()
+   {
+      Console.WriteLine("The engine turns off, and the car stops suddenly");
+      Console.WriteLine();
+      _car.ChangeState(new Off(_car));
+   }
+
+   public override void PressBrake()
+   {
+      Console.WriteLine("The car slows to a stop");
+      Console.WriteLine();
+      _car.ChangeState(new Stopped(_car));
+   }
+}

patterns/state/CarState/States/Off.cs

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+#region
+
+using System;
+
+#endregion
+
+namespace CarState.States;
+
+public class Off : State
+{
+   public Off(Car car)
+      : base(car) { }
+
+   public override void TurnKeyClockwise()
+   {
+      Console.WriteLine("The engine has started");
+      Console.WriteLine();
+      _car.ChangeState(new Stopped(_car));
+   }
+}

patterns/state/CarState/States/State.cs

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+namespace CarState.States;
+
+public class State
+{
+   protected Car _car;
+
+   public State(Car car)
+   {
+      _car = car;
+   }
+
+   public virtual void TurnKeyClockwise() { }
+
+   public virtual void TurnKeyCounterClockwise() { }
+
+   public virtual void PressGas() { }
+
+   public virtual void PressBrake() { }
+}

patterns/state/CarState/States/Stopped.cs

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+#region
+
+using System;
+
+#endregion
+
+namespace CarState.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));
+   }
+}