Add startup and reset commands

modules/gateway/README.md

@@ -7,7 +7,20 @@ echo "`pwd`/src/main/python `pwd`/src/test/python" > usquad-venv/lib/python3.8/s
 
 # How to use
 
-Execute
+* Ensure that your MQTT broker is running on port 1883
+
+* Execute:
 ```
 . ./setup-venv.sh
+python -m microsquad.gateway.mqtt
 ```
+
+* Follow the instructions given by Bitio to detect your Micro:bit and the gateway should start.
+
+# How to reset your broker's persistent data (Mosquitto)
+
+```bash
+sudo service mosquitto stop
+sudo rm /var/lib/mosquitto/mosquitto.db
+sudo service mosquitto start
+```