Added decorator pattern

Author: Habrador

Assets/Patterns/20. Decorator.meta

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Decorator.OrderSystem
+{
+    public class Cybertruck : _Car
+    {
+        public Cybertruck()
+        {
+            this.description = "Cybertruck";
+        }
+
+        public override string GetDescription() => this.description;
+
+        public override float Cost() => PriceList.cybertruck;
+    }
+}

Assets/Patterns/20. Decorator/Tesla order system.meta

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Decorator.OrderSystem
+{
+    public class DracoThruster : _CarExtras
+    {
+        private _Car prevCarPart;
+
+
+        public DracoThruster(_Car prevCarPart, int howMany)
+        {
+            this.prevCarPart = prevCarPart;
+            this.howMany = howMany;
+        }
+
+
+        public override string GetDescription() => $"{prevCarPart.GetDescription()}, {howMany} Draco Thruster";
+        
+
+        public override float Cost() => (PriceList.dracoThruster * howMany) + prevCarPart.Cost();
+    }
+}

Assets/Patterns/20. Decorator/Tesla order system/Car parts.meta

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Decorator.OrderSystem
+{
+    public class EjectionSeat : _CarExtras
+    {
+        private _Car prevCarPart;
+
+
+        public EjectionSeat(_Car prevCarPart, int howMany)
+        {
+            this.prevCarPart = prevCarPart;
+            this.howMany = howMany;
+        }
+
+
+        public override string GetDescription() => $"{prevCarPart.GetDescription()}, {howMany} Ejection Seat";
+        
+
+        public override float Cost() => (PriceList.ejectionSeat * howMany) + prevCarPart.Cost();
+    }
+}