Add flatpak manifest to Kirigami template
This allows to directly build the new app using Flatpak.
cc @jbbgameich since I copied it from https://invent.kde.org/jbbgameich/plasma-mobile-app-template
Edited by Carl Schwan
This allows to directly build the new app using Flatpak.
cc @jbbgameich since I copied it from https://invent.kde.org/jbbgameich/plasma-mobile-app-template