Update readme to reflect new RabbitMQ testing

Author: GISDev01

README.md

@@ -6,3 +6,6 @@ bin\windows\zookeeper-server-start.bat config\zookeeper.properties
 bin\windows\kafka-server-start.bat config\server.properties
 
 For Windows, get RabbitMQ installed by following their instructions here: https://www.rabbitmq.com/download.html
+
+For Mac, you can get RabbitMQ up and running quickly with homebrew: brew install rabbitmq
+After the brew runs, you can fire up RabbitMQ on your Mac with the command: rabbitmq-server