Update README.md

Author: mario-guerra

README.md

@@ -24,5 +24,9 @@ The listener does some simple message processing in the form of matching the pla
 The listener uses values read from a .env file to build a connection string to your service bus implementation.
 Replace the values in '<>' brackets listed in the .env file with the relevant details from your servcice bus instance.
 
+Usage:
+From the repo base directory, type...
+>cargo run
+
 The listener will loop forever, waiting to read messages from the service bus. You will need another tool to send messages to the service bus.
-At some point I will get around to creating a sender to match the listener. 
+The 'rustybus' project (https://github.com/mario-guerra/rustybus) can be used to send messages into the queue for rust-listener to consume.