Add location for desktop files

Guides/os.md

@@ -42,6 +42,10 @@ Use the command : `sudo update-alternatives --config x-terminal-emulator`
 
 FTL and Into the Breach saves are in `.local/share/` folder.
 
+### Add desktp apps
+
+Set your _desktop_ file in `~/.local/share/applications/`.
+
 ## Grub
 
 `sudo update-grub`