Add code examples, and documentation

patterns/state/WithStatePattern/States/State.cs

@@ -0,0 +1,19 @@
+namespace WithStatePattern.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() { }
+}