You want to know how to create a database? There are many excellent tutorials in the internet on how to create a database. May I recommend that you use MySQL, it's a bit easier to access from most MCU's, on this site.
Once you have created a dB you write code that loads onto the MCU (microcontroller unit), The code will reach out to the dB get the info and react accordingly once the user has been ID'd.
Creating a dB is beyond the scope of this website.