It's time to add some users to this application, to add authentication because many apps which you'll
build will have authentication. They need users who can sign up or login or logout to really work
and therefore in this module, we will thoroughly walk through everything that's included with signing
users up, signing them in,
logging them out, giving them access to the backend so that they can send data to protected resources
there and so that only authenticated users can interact with the back-end and so on. We will do all of that
in this module and you will learn how authentication works in native apps like this and how you can
implement it in this React Native app.