Adding a .mojo or .🔥file to a magic project

I've created a project using

magic init hello-world --format mojo-project
cd hello-world && magic shell

magic init hello-world --format mojo-project
cd hello-world && magic shell

but how could I add a file to this project / view its directory?
(Using WSL Ubuntu)
Thanks in advance.

Adding a .mojo or .🔥file to a magic project - Modular