Added a sub-package for "creational" in order to organize the code better

src/main/java/com/designpatterns/builderpattern/Desktop.java → src/main/java/com/designpatterns/creational/builder/Desktop.java

-package src.main.java.com.designpatterns.builderpattern;
+package src.main.java.com.designpatterns.creational.builder;
 
 /**
  * The Builder is a design pattern designed to provide a flexible solution to various object creation problems in

src/main/java/com/designpatterns/factorypattern/Pentagon.java → src/main/java/com/designpatterns/creational/factory/Pentagon.java

-package src.main.java.com.designpatterns.factorypattern;
+package src.main.java.com.designpatterns.creational.factory;
 
 public class Pentagon implements Polygon {
     @Override

src/main/java/com/designpatterns/factorypattern/Polygon.java → src/main/java/com/designpatterns/creational/factory/Polygon.java

-package src.main.java.com.designpatterns.factorypattern;
+package src.main.java.com.designpatterns.creational.factory;
 
 public interface Polygon {
     /**

src/main/java/com/designpatterns/factorypattern/PolygonFactory.java → src/main/java/com/designpatterns/creational/factory/PolygonFactory.java

-package src.main.java.com.designpatterns.factorypattern;
+package src.main.java.com.designpatterns.creational.factory;
 
 /**
  * In class-based programming, the factory method pattern is a creational pattern that uses factory methods to deal

src/main/java/com/designpatterns/factorypattern/Square.java → src/main/java/com/designpatterns/creational/factory/Square.java

-package src.main.java.com.designpatterns.factorypattern;
+package src.main.java.com.designpatterns.creational.factory;
 
 public class Square implements Polygon {
 

src/main/java/com/designpatterns/factorypattern/Triangle.java → src/main/java/com/designpatterns/creational/factory/Triangle.java

-package src.main.java.com.designpatterns.factorypattern;
+package src.main.java.com.designpatterns.creational.factory;
 
 public class Triangle implements Polygon {
     @Override

src/main/java/com/designpatterns/singletonpattern/Singleton.java → src/main/java/com/designpatterns/creational/singleton/Singleton.java

-package src.main.java.com.designpatterns.singletonpattern;
+package src.main.java.com.designpatterns.creational.singleton;
 
 /**
  * The singleton pattern is a design pattern that restricts the instantiation of a class to one "single" instance.

src/test/java/com/designpatterns/builderpattern/DesktopBuilderTest.java → src/test/java/com/designpatterns/creational/builder/DesktopBuilderTest.java

-package src.test.java.com.designpatterns.builderpattern;
+package src.test.java.com.designpatterns.creational.builder;
 
 import org.junit.Assert;
 import org.junit.Test;
-import src.main.java.com.designpatterns.builderpattern.Desktop;
+import src.main.java.com.designpatterns.creational.builder.Desktop;
 
 public class DesktopBuilderTest {
     private final String configOne = "Desktop{CPU='Intel i7', RAM='Corsair Vengeance 3000', isGraphicCardEnabled=true" +

src/test/java/com/designpatterns/factorypattern/PolygonFactoryTest.java → src/test/java/com/designpatterns/creational/factory/PolygonFactoryTest.java

-package src.test.java.com.designpatterns.factorypattern;
+package src.test.java.com.designpatterns.creational.factory;
 
 import org.junit.Assert;
 import org.junit.Test;
-import src.main.java.com.designpatterns.factorypattern.Polygon;
-import src.main.java.com.designpatterns.factorypattern.PolygonFactory;
+import src.main.java.com.designpatterns.creational.factory.Polygon;
+import src.main.java.com.designpatterns.creational.factory.PolygonFactory;
 
 public class PolygonFactoryTest {
     @Test

src/test/java/com/designpatterns/singletonpattern/SingletonTest.java → src/test/java/com/designpatterns/creational/singleton/SingletonTest.java

-package src.test.java.com.designpatterns.singletonpattern;
+package src.test.java.com.designpatterns.creational.singleton;
 
 import org.junit.Assert;
 import org.junit.Test;
-import src.main.java.com.designpatterns.singletonpattern.Singleton;
+import src.main.java.com.designpatterns.creational.singleton.Singleton;
 
 import java.util.ArrayList;
 import java.util.concurrent.ExecutorService;