added facade sample

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

@@ -0,0 +1,37 @@
+package com.iluwatar;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class DwarvenGoldmineFacade {
+
+	List<DwarvenMineWorker> workers;
+	
+	public DwarvenGoldmineFacade() {
+		workers = new ArrayList<>();
+		workers.add(new DwarvenGoldDigger());
+		workers.add(new DwarvenCartOperator());
+		workers.add(new DwarvenTunnelDigger());
+	}
+	
+	public void startNewDay() {
+		for (DwarvenMineWorker worker: workers) {
+			worker.wakeUp();
+			worker.goToMine();
+		}
+	}
+	
+	public void digOutGold() {
+		for (DwarvenMineWorker worker: workers) {
+			worker.work();
+		}
+	}
+	
+	public void endDay() {
+		for (DwarvenMineWorker worker: workers) {
+			worker.goHome();
+			worker.goToSleep();
+		}
+	}
+	
+}