added chain of responsibility sample

chain/src/main/java/com/iluwatar/OrcCommander.java

@@ -0,0 +1,22 @@
+package com.iluwatar;
+
+public class OrcCommander extends RequestHandler {
+
+	public OrcCommander(RequestHandler handler) {
+		super(handler);
+	}
+	
+	@Override
+	public void handleRequest(Request req) {
+		if (req.getRequestType().equals(RequestType.DEFEND_CASTLE)) {
+			printHandling(req);
+		} else {
+			super.handleRequest(req);
+		}
+	}
+
+	@Override
+	public String toString() {
+		return "Orc commander";
+	}
+}