add sway screenshot shortcuts (with grim and swappy)

sway/.config/sway/config

@@ -85,6 +85,12 @@ bindsym $mod+d exec $menu
 # Lock the screen
 bindsym $mod+Shift+s exec $lock
 
+# Screenshot (whole screen)
+bindsym $mod+p exec grim - | swappy -f -
+
+# Screenshot (screen region)
+bindsym $mod+Shift+p exec grim -g "$(slurp)" - | swappy -f -
+
 # Drag floating windows by holding down $mod and left mouse button.
 # Resize them with right mouse button + $mod.
 # Despite the name, also works for non-floating windows.