As others have mentioned, the directory called shared is literally a shared directory between the host operating system (in your case Windows) and the the guest operating system which you are running inside the virtual machine.
Both the Operating systems can read and write files to this directory and hence you can put the configuration files in this directory either way i.e. from window (using GUI) or from vagrant environment (using command line).
Hope it helps!
If you have any other query then please feel free to get back to us.
Curriculum Support Engineer