Added a logging JMS consumer stub

dddsample/src/main/java/se/citerus/dddsample/infrastructure/messaging/jms/SimpleLoggingConsumer.java

+package se.citerus.dddsample.infrastructure.messaging.jms;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import javax.jms.Message;
+import javax.jms.MessageListener;
+
+public class SimpleLoggingConsumer implements MessageListener {
+
+  private final Log logger = LogFactory.getLog(SimpleLoggingConsumer.class);
+
+  @Override
+  public void onMessage(Message message) {
+    logger.debug("Received JMS message: " + message);
+  }
+
+}