Added comments for iterator example.

iterator/src/main/java/com/iluwatar/App.java

 package com.iluwatar;
 
+/**
+ * 
+ * Iterator (ItemIterator) adds abstraction layer on top of a 
+ * collection (TreasureChest). This way the collection can change 
+ * its internal implementation without affecting its clients.
+ *
+ */
 public class App 
 {
     public static void main( String[] args )

iterator/src/main/java/com/iluwatar/ItemIterator.java

 package com.iluwatar;
 
+/**
+ * 
+ * Iterator interface.
+ *
+ */
 public interface ItemIterator {
 
 	boolean hasNext();

iterator/src/main/java/com/iluwatar/TreasureChest.java

@@ -3,6 +3,11 @@ package com.iluwatar;
 import java.util.ArrayList;
 import java.util.List;
 
+/**
+ * 
+ * Collection class.
+ *
+ */
 public class TreasureChest {
 
 	private List<Item> items;