Update README.md

Author: ycarowr

README.md

@@ -46,6 +46,7 @@ Most of the of references are listed on the bottom of this page, as well as more
  2. [Factory Method](https://github.com/ycarowr/DesignPatterns/tree/master/Assets/Creational/FactoryMethod)
  3. [Singleton](https://github.com/ycarowr/DesignPatterns/tree/master/Assets/Creational/Singleton)
  4. [Prototype](https://github.com/ycarowr/Unity-Design-Patterns/tree/master/Assets/Creational/Prototype)
+ 5. [Service Locator](https://github.com/ycarowr/Unity-Design-Patterns/tree/master/Assets/Creational/ServiceLocator)
 
 ### Game Programming Patterns
  1. [Object Pool](https://github.com/ycarowr/DesignPatterns/tree/master/Assets/GameProgramming/ObjectPooler)