Add desktop files as per complaint.

A desktop file for theme-selector and rofi itself.

data/rofi-theme-selector.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Encoding=UTF-8
+Version=1.0
+Type=Application
+Terminal=false
+Exec=rofi-theme-selector
+Name=Rofi Theme Selector
+Icon=rofi

data/rofi.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Encoding=UTF-8
+Version=1.0
+Type=Application
+Terminal=false
+Exec=rofi -show
+Name=Rofi
+Icon=rofi

meson.build

@@ -29,8 +29,10 @@ foreach f : flags
     endif
 endforeach
 
-plugindir = join_paths(get_option('libdir'), meson.project_name())
-themedir = join_paths(get_option('datadir'), meson.project_name(), 'themes')
+plugindir  = join_paths(get_option('libdir'), meson.project_name())
+themedir   = join_paths(get_option('datadir'), meson.project_name(), 'themes')
+desktop_install_dir = join_paths(get_option('datadir'), 'applications')
+icondir    = join_paths(get_option('datadir'), 'icons','hicolor', 'scalable', 'apps')
 
 glib_min_major=2
 glib_min_minor=40
@@ -130,6 +132,16 @@ install_data(
     install_dir: join_paths(get_option('prefix'), get_option('bindir'))
 )
 
+install_data(
+  'data/rofi-theme-selector.desktop',
+  'data/rofi.desktop',
+  install_dir: desktop_install_dir
+  )
+install_data(
+  'data/rofi.svg',
+  install_dir: icondir
+)
+
 flex = generator(find_program('flex'),
     output: '@BASENAME@.c',
     arguments: [ '-o', '@OUTPUT@', '@INPUT@' ]