Link tutorial in README

README.md

@@ -21,6 +21,7 @@ $ pip install -r requirements.txt
 ```
 - Note, to install flask in your own `$HOME` use `pip install --user Flask`.
 ### RabbitMQ
+(Reference [Tutorial Part Four](https://www.rabbitmq.com/tutorials/tutorial-four-python.html))
 - Install RabbitMQ server on the host machine. (Tutorials [here](https://www.rabbitmq.com/download.html).)
   - Additionally, if on a Mac, it is recommended that you add the following line to your `.bash_profile`:  
  `export PATH=$PATH:/usr/local/opt/rabbitmq/sbin`.