More commentary and instruction at the start

[SQLSprint]

https://github.com/solliancenet/tech-immersion-data-ai/blob/master/ai-exp3/README.md#exercise-1-creating-a-model-using-automated-machine-learning

Starts with "Navigate to your Azure Machine Learning workspace in the Azure Portal." Many attendees open their local browser at that point or are blocked due to a lack of Azure experience. More commentary and instruction would be great before that step, including:

• How to start the VM
• How to overcome gateway warnings
• How to open the Azure portal
• How to authenticate to the Azure portal
• Where to locate the credentials
• How to navigate to the Azure Machine Learning workspace