gnome-screenshot: add page (#7916)

pages/linux/gnome-screenshot.md

@@ -0,0 +1,36 @@
+# gnome-screenshot
+
+> Capture the screen, a window, or a user-defined area and save the image to a file.
+> More information: <https://apps.gnome.org/app/org.gnome.Screenshot>.
+
+- Take a screenshot and save it to the default location, normally `~/Pictures`:
+
+`gnome-screenshot`
+
+- Take a screenshot and save it to the named file location:
+
+`gnome-screenshot --file {{path/to/file}}`
+
+- Take a screenshot and save it to the clipboard:
+
+`gnome-screenshot --clipboard`
+
+- Take a screenshot after the specified number of seconds:
+
+`gnome-screenshot --delay {{5}}`
+
+- Launch the GNOME Screenshot GUI:
+
+`gnome-screenshot --interactive`
+
+- Take a screenshot of the current window and save it to the specified file location:
+
+`gnome-screenshot --window --file {{path/to/file}}`
+
+- Take a screenshot after the specified number of seconds and save it to the clipboard:
+
+`gnome-screenshot --delay {{10}} --clipboard`
+
+- Display the version:
+
+`gnome-screenshot --version`