Auth for a Shiny App

I need to protect a Shiny App with user access; so I need help developing this autentication form. It must: 1) have the possibility to enroll new clients (they should be able to create their own username, password) 2) when a client wants to create an account, he/she must provide: name, email, username, password, date of creating the account. 3) The form must be at the center of the screen and the background a picture (or black). 4) The DDBB should be store in a rds file and will update each time a new user wants to enroll. 5) the rds file will be storage in a specific folder inside the project.