Improve Factory Method Javadoc

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

@@ -2,7 +2,14 @@ package com.iluwatar.factory.method;
 
 /**
  * 
- * In Factory Method we have an interface ({@link Blacksmith}) with a method for
+ * The Factory Method is a creational design pattern which uses factory methods to deal 
+ * with the problem of creating objects without specifying the exact class of object 
+ * that will be created. This is done by creating objects via calling a factory 
+ * method either specified in an interface and implemented by child classes, or implemented 
+ * in a base class and optionally overridden by derived classes—rather than by calling a 
+ * constructor.
+ * <p>
+ * In this Factory Method example we have an interface ({@link Blacksmith}) with a method for
  * creating objects ({@link Blacksmith#manufactureWeapon}). The concrete subclasses 
  * ({@link OrcBlacksmith}, {@link ElfBlacksmith}) then override the method to produce 
  * objects of their liking.