qjoypad: add page (#5783)

* qjoypad: add page

* Fix typo

Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>

* Apply suggestion from code review

Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>

Co-authored-by: bl-ue <54780737+bl-ue@users.noreply.github.com>

pages/linux/qjoypad.md

@@ -0,0 +1,28 @@
+# qjoypad
+
+> Translate input from gamepads or joysticks into keyboard strokes or mouse actions.
+> More information: <http://qjoypad.sourceforge.net/>.
+
+- Start QJoyPad:
+
+`qjoypad`
+
+- Start QJoyPad and look for devices in a specific directory:
+
+`qjoypad --device={{path/to/directory}}`
+
+- Start QJoyPad but don't show a system tray icon:
+
+`qjoypad --notray`
+
+- Start QJoyPad and force the window manager to use a system tray icon:
+
+`qjoypad --force-tray`
+
+- Force a running instance of QJoyPad to update its list of devices and layouts:
+
+`qjoypad --update`
+
+- Load the given layout in an already running instance of QJoyPad, or start QJoyPad using the given layout:
+
+`qjoypad "{{layout}}"`