Create New Users in Firebase Authentication and Store within the Database

We'll learn how to create new users/let users sign up in Firebase using our application. The Firebase auth store gives us createUserWithEmailAndPassword that will create a user and return a userCredential for us to store in our database.

We'll also learn how our database and authentication system aren't connected by default and we'll create a user profile document in the Firestore database. The process here will be very similar to how we created the tasks collection.