It's created during the first run of handWavey, and the configuration files are created at the same time.
~/.config/handWavey
You can see it explicitly with
echo ~/.config/handWavey
And see the files inside it with
ls ~/.config/handWavey
Same as Linux?
%USERPROFILE%\handWavey
You can see it explicitly with
echo %USERPROFILE%\handWavey
And see the files inside it with
dir %USERPROFILE%\handWavey