How can git, for example, create the database that they use?

Hi, so I am working on a terminal application and would like to use a database. I'm not sure if this is the best way to do this though.

So, I want the program to be able to be installed just like you, git or with a brew installation, etc. And then everyone who installs it will have their own database, to which certain commands will be available.

I'm just not sure what the best way to do this? I was thinking about every record that I would put in the database, could I just create a file in .directory?

Thank.