xdg-desktop-menu: add page (#8102)

pages/linux/xdg-desktop-menu.md

@@ -0,0 +1,20 @@
+# xdg-desktop-menu
+
+> Command-line tool for installing or uninstalling desktop menu items.
+> More information: <https://manned.org/xdg-desktop-menu>.
+
+- Install an application to the desktop menu system:
+
+`xdg-desktop-menu install {{path/to/file.desktop}}`
+
+- Install an application to the desktop menu system with the vendor prefix check disabled:
+
+`xdg-desktop-menu install --novendor {{path/to/file.desktop}}`
+
+- Uninstall an application from the desktop menu system:
+
+`xdg-desktop-menu uninstall {{path/to/file.desktop}}`
+
+- Force an update of the desktop menu system:
+
+`xdg-desktop-menu --forceupdate {{user|system}}`