fixed a small issue in the readme

README.md

@@ -40,7 +40,7 @@ Listening at http//localhost:8080
 
 If you see an error check to see if the port 8080 is already in use on your machine and if it is feel free to change the port to a free one by changing the code in server.js on line 23.
 
-Open your browser of choice and go to the URL http//localhost:8080.  You should see the following in you browser:
+Open your browser of choice and go to the URL http//localhost:8080/device.html.  You should see the following in you browser:
 
 ![Initial browser screen](https://github.com/iot-for-all/iot-central-web-mqtt-device/blob/main/assets/initialscreen.png "Initial browser screen")