Add desktop file

data/meson.build

@@ -25,3 +25,7 @@ gnome.compile_resources('countdown',
     install_dir: pkgdatadir,
     dependencies: blueprints
 )
+
+install_data('uk.me.bcowan.Countdown.desktop',
+    install_dir: join_paths(get_option('datadir'), 'applications')
+)

data/uk.me.bcowan.Countdown.desktop

+# SPDX-FileCopyrightText: 2022 Bruce Cowan <bruce@bcowan.me.uk>
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
+[Desktop Entry]
+Name=Countdown
+Exec=countdown
+Terminal=false
+Type=Application
+Categories=GNOME;GTK;Utility;Clock;
+StartupNotify=true
\ No newline at end of file