How to add Auth0 authentication to a serverless API

Link to chapter — https://serverless-stack.com/examples/how-to-add-auth0-authentication-to-a-serverless-api.html

The example doesn’t give steps or doc pointers as to how to set the AUTH0_DOMAIN environment variable so that the Lambda can have access to it.

Added a PR showing adding the values to .env

This example would benefit from showing the Lambda function accessing the JWT information, and a link to details of what data is available via that object.