Kudos are read by app centers such as GNOME Software and Discover
to calculate the "awesomeness" level of the application. OBS Studio
qualifies for two of these kudos: the "hi-dpi icon" kudo, since we
have 128x128 and bigger icons; and the "modern toolkit" icon, since
we use Qt5.
Add these kudos to the AppData file, and let app centers tell the
world how awesome OBS Studio is :)