Users registration just right enter website and/or opening the app

It will be nice, in order to enhance & grow the community of a directory, to ask users to register/log in just after they enter the website (before showing them the home page), and/or when opening the app (before showing the home screen). So everyone has to register to see even the hoomepage and accesing the whole platform.

Thanks for considering, I would use it in many projects.

Matias