Deleted the files which were before in master (Those can be found in the releases > 0.3.0)
Uploaded new files which are of the 0.5.2 version
Now you can open a Basilisk II config file (To add it, open the New Mac Wizard, select "Create from file" and set the emulator to Basilisk II)
and also you can edit and save it (Note that to edit it you must open the section "Edit Config File Manually" and make your changes there)