Added new module to demonstrate topic "Introduction to RabbitMQ". (#1197)

rabbitmq/src/main/java/com/baeldung/producer/Publisher.java

@@ -0,0 +1,27 @@
+package com.baeldung.producer;
+
+import com.rabbitmq.client.*;
+
+import java.io.IOException;
+import java.util.concurrent.TimeoutException;
+
+public class Publisher {
+
+    private final static String QUEUE_NAME = "products_queue";
+
+    public static void main(String[]args) throws IOException, TimeoutException {
+        ConnectionFactory factory = new ConnectionFactory();
+        factory.setHost("localhost");
+        Connection connection = factory.newConnection();
+        Channel channel = connection.createChannel();
+
+        String message = "product details";
+        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
+
+        channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
+        System.out.println(" [x] Sent '" + message + "'");
+
+        channel.close();
+        connection.close();
+    }
+}