add screenshit script for mango

modules/home/screenshot

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+case "${1:-fullscreen}" in
+  region)
+    g=$(slurp -d); [ -z "$g" ] && exit 1
+    grim -g "$g" - | wl-copy ;;
+  window)
+    g=$(mmsg get focusing-client | jq -r '"\(.x),\(.y) \(.width)x\(.height)"')
+    [ -z "$g" ] && exit 1
+    grim -g "$g" - | wl-copy ;;
+  output)
+      grim -o "$(mmsg get cursorpos | jq -r .monitor)" - | wl-copy;;
+    *) grim - | wl-copy;;
+esac