Commiting readme.md changes for PR (#2)

As per issues #1, the PR for updating the readme.md file to make install process work + added a handy suggestion in configuration menu that made use of this program more user friendly and convenient as a Fedora user (should work for anyone on Gnome 3 however such as Ubuntu users)

Authored-by: domacikolaci <adamknez@protonmail.com>
Reviewed-on: https://git.volkor.me/Volkor/SUpload/pulls/2


Co-authored-by: domacikolaci <domacikolaci@noreply.localhost>
Co-committed-by: domacikolaci <domacikolaci@noreply.localhost>