Add desktop file and icon to meson build script

data/meson.build

@@ -0,0 +1,26 @@
+desktop_conf = configuration_data()
+desktop_conf.set('NAME', meson.project_name())
+desktop_conf.set('ICON', application_id)
+desktop_conf.set('APP_ID', application_id)
+desktop_conf.set('EXEC', meson.project_name())
+
+# Desktop file
+configure_file(
+  input: '@0@.desktop.in'.format(application_id),
+  output: '@BASENAME@',
+  install: true,
+  configuration: desktop_conf,
+  install_dir: applicationsdir
+)
+
+# Scalable icon
+install_data(
+  '@0@.svg'.format(application_id),
+  install_dir: iconsdir / 'hicolor' / 'scalable' / 'apps',
+)
+
+# Symbolic icon
+install_data(
+  '@0@-symbolic.svg'.format(application_id),
+  install_dir: iconsdir / 'hicolor' / 'symbolic' / 'apps',
+)