add desktop file

bing-wallpaper.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Name=Bing wallpaper updater
+Comment=Update wallpaper using bing daily picture
+TryExec=bingUpdateWallpaper
+Exec=bingUpdateWallpaper
+Type=Application
+StartupNotify=true
+