Added comments for Abstract Factory example.

abstract-factory/src/main/java/com/iluwatar/App.java

 package com.iluwatar;
 
+/**
+ * 
+ * The essence of the Abstract Factory pattern is a factory interface (KingdomFactory)
+ * and its implementations (ElfKingdomFactory, OrcKingdomFactory).
+ * 
+ * The example uses both concrete implementations to create a king, a castle and an
+ * army.
+ *
+ */
 public class App 
 {
     public static void main( String[] args )

abstract-factory/src/main/java/com/iluwatar/ElfKingdomFactory.java

 package com.iluwatar;
 
+/**
+ * 
+ * Concrete factory.
+ *
+ */
 public class ElfKingdomFactory implements KingdomFactory {
 
 	public Castle createCastle() {

abstract-factory/src/main/java/com/iluwatar/KingdomFactory.java

 package com.iluwatar;
 
+/**
+ * 
+ * The factory interface.
+ *
+ */
 public interface KingdomFactory {
 
 	Castle createCastle();

abstract-factory/src/main/java/com/iluwatar/OrcKingdomFactory.java

 package com.iluwatar;
 
+/**
+ * 
+ * Concrete factory.
+ *
+ */
 public class OrcKingdomFactory implements KingdomFactory {
 
 	public Castle createCastle() {