users, where we store all the users of our app, along with their login credentials:
LoginUserclass, which in turn also extends the Item class just as we learned in the Items guide, so it will be also the Item class that will represent an individual user in your app. Our
Userclass will start looking like this:
userNameFieldNameThe name of the field that holds the user name we want our users to identify with.
encryptedPasswordFieldNameThe name of the field that holds the encrypted password of the users.