how to add my own credentials to shinymobile

I'm trying to build a shinymobile app. It is important to have a login page ate beginning.

As far as the examples shows, there is some way but you never find how.

in the documentation page:
shinyMobile/f7Login.R at master · RinteRface/shinyMobile · GitHub

is written in line 5:

#' This function does not provide the backend features. You would
#' need to store credentials in a database for instance.

From lines 31 to 64 there is a sample of a app with global authentication, but its open. Does not shows how to add the credentials.

but HOW to add these credentials?????

Can anyone help me?
thanks