GDevelop in AppImageHub

AppImageHub is the official list of Linux apps in the AppImage format, with links to their download pages.

Since GDevelop is now available as an AppImage, it now has the right to be on AppImageHub :v:, which would help it’s discoverability for Linux users :penguin: as it will appear in ‘App Outlet’ (An app that shows apps from Flathub, Snapcraft and AppImageHub).