xfce4-screenshooter: add page (#2734)

pages/linux/xfce4-screenshooter.md

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+# xfce4-screenshooter
+
+> The XFCE4 screenshot tool.
+
+- Launch the screenshooter GUI:
+
+`xfce4-screenshooter`
+
+- Take a screenshot of the entire screen and launch the GUI to ask how to proceed:
+
+`xfce4-screenshooter --fullscreen`
+
+- Take a screenshot of the entire screen and save it in the specified directory:
+
+`xfce4-screenshooter --fullscreen --save {{path/to/directory}}`
+
+- Wait some time before taking the screenshot:
+
+`xfce4-screenshooter --delay {{seconds}}`
+
+- Take a screenshot of a region of the screen (select using the mouse):
+
+`xfce4-screenshooter --region`
+
+- Take a screenshot of the active window, and copy it to the clipboard:
+
+`xfce4-screenshooter --window --clipboard`
+
+- Take a screenshot of the active window, and open it with a choosen program:
+
+`xfce4-screenshooter --window --open {{gimp}}`