Update README.md

Author: glibnub

README.md

@@ -16,9 +16,11 @@ description: Sample of a simulator for Raspberry Pi.
 Click to visit **[Demo page](https://azure-samples.github.io/raspberry-pi-web-simulator/build/index.html)** This is the preview version and we'd like to have your feedback. You can submitt issues or chat with the product team in the gitter.
 
 ## How to register an IoT hub
+
 Click [this page](https://docs.microsoft.com/azure/iot-hub/iot-hub-raspberry-pi-web-simulator-get-started) and follow it to create your own IoT hub
 
 ## Usage
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 - Replace the connection string with your Azure IoT hub device connection string, and click `run` button or type `npm start` in the console to run a client application to
 
  - send message to IoT hub