added iterator sample

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

@@ -0,0 +1,35 @@
+package com.iluwatar;
+
+public class App 
+{
+    public static void main( String[] args )
+    {
+    	TreasureChest chest = new TreasureChest();
+    	
+    	ItemIterator ringIterator = chest.Iterator(ItemType.RING);
+    	while (ringIterator.hasNext()) {
+    		System.out.println(ringIterator.next());
+    	}
+    	
+    	System.out.println("----------");
+    	
+    	ItemIterator potionIterator = chest.Iterator(ItemType.POTION);
+    	while (potionIterator.hasNext()) {
+    		System.out.println(potionIterator.next());
+    	}
+    	
+    	System.out.println("----------");
+    	
+    	ItemIterator weaponIterator = chest.Iterator(ItemType.WEAPON);
+    	while (weaponIterator.hasNext()) {
+    		System.out.println(weaponIterator.next());
+    	}
+    	
+    	System.out.println("----------");
+    	
+    	ItemIterator it = chest.Iterator(ItemType.ANY);
+    	while (it.hasNext()) {
+    		System.out.println(it.next());
+    	}
+    }
+}