added observer sample

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

@@ -0,0 +1,18 @@
+package com.iluwatar;
+
+public class App 
+{
+    public static void main( String[] args )
+    {
+
+    	Weather weather = new Weather();
+    	weather.addObserver(new Orcs());
+    	weather.addObserver(new Hobbits());
+    	
+    	weather.timePasses();
+    	weather.timePasses();
+    	weather.timePasses();
+    	weather.timePasses();
+    	
+    }
+}