added facade sample

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

@@ -0,0 +1,25 @@
+package com.iluwatar;
+
+public abstract class DwarvenMineWorker {
+
+	public void goToSleep() {
+		System.out.println(name() + " goes to sleep.");
+	}
+	
+	public void wakeUp() {
+		System.out.println(name() + " wakes up.");
+	}
+	
+	public void goHome() {
+		System.out.println(name() + " goes home.");
+	}
+	
+	public void goToMine() {
+		System.out.println(name() + " goes to the mine.");
+	}
+	
+	public abstract void work();
+	
+	public abstract String name();
+	
+}