added facade sample

facade/src/main/java/com/iluwatar/DwarvenTunnelDigger.java

@@ -0,0 +1,15 @@
+package com.iluwatar;
+
+public class DwarvenTunnelDigger extends DwarvenMineWorker {
+
+	@Override
+	public void work() {
+		System.out.println(name() + " creates another promising tunnel.");
+	}
+
+	@Override
+	public String name() {
+		return "Dwarven tunnel digger";
+	}
+
+}