Add a flatpak file to make it buildable in gnome-builder
Gnome builder search for a flatpak manifest and if it find it that file is used to build using flatpak. Provide a flatpak manifest file will simplify the development for newcommers.
Gnome builder search for a flatpak manifest and if it find it that file is used to build using flatpak. Provide a flatpak manifest file will simplify the development for newcommers.