Getting started doc questions

[leggers]

A few questions I had when reading the getting started doc:

1. What does the example app do? Why?
2. Why is API key creation necessary? (This might be answered once 1 is answered.)
3. How does the example app use Beyond Identity software? What files should I read to understand that? As a developer who wants to use BI to authenticate users to my NodeJS app, I don't know what to do once I've completed the getting started guide.
4. Which of the configuration values that I use in my application should I keep secret? Is my tenant ID a secret?

[nmelo]

@ismailmustafa could you help describe some of these?