The AppStream file is mostly copied from the one already used by the
Flatpak yuzu build:
62fc225acf/org.yuzu_emu.yuzu.metainfo.xml
As it already defines the application id as org.yuzu_emu.yuzu I renamed
the yuzu.desktop and yuzu.xml files so that they match.
I've also made some minor tweaks to it, like fixing the capitalization
of "yuzu", adding a few keys and sorting them as presented in the
documentation.
Lastly, I added PrefersNonDefaultGPU=true to the .desktop file so that
yuzu is launched with the dedicated graphics card on Linux.
Andrea Pappacoda