added observer sample

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

@@ -0,0 +1,25 @@
+package com.iluwatar;
+
+public class Hobbits implements WeatherObserver {
+
+	@Override
+	public void update(WeatherType currentWeather) {
+		switch (currentWeather) {
+		case COLD:
+			System.out.println("The hobbits are shivering in the cold weather.");
+			break;
+		case RAINY:
+			System.out.println("The hobbits look for cover from the rain.");
+			break;
+		case SUNNY:
+			System.out.println("The happy hobbits bade in the warm sun.");
+			break;
+		case WINDY:
+			System.out.println("The hobbits hold their hats tightly in the windy weather.");
+			break;
+		default:
+			break;
+		}
+	}
+
+}