added observer sample

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

@@ -0,0 +1,25 @@
+package com.iluwatar;
+
+public class Orcs implements WeatherObserver {
+
+	@Override
+	public void update(WeatherType currentWeather) {
+		switch (currentWeather) {
+		case COLD:
+			System.out.println("The orcs are freezing cold.");
+			break;
+		case RAINY:
+			System.out.println("The orcs are dripping wet.");
+			break;
+		case SUNNY:
+			System.out.println("The sun hurts the orcs' eyes.");
+			break;
+		case WINDY:
+			System.out.println("The orc smell almost vanishes in the wind.");
+			break;
+		default:
+			break;
+		}
+	}
+
+}