re-add screengrab script

bin/screengrab

@@ -0,0 +1,23 @@
+#!/usr/bin/env sh
+set -euo pipefail
+
+DIR=${XDG_SCREENSHOT_DIR:-$HOME}
+TARGET="${DIR}/screenshot/grab-$(date +'%Y%m%d%H%M%S').png"
+
+has() {
+	command -v $1 &>/dev/null
+}
+
+die() {
+	echo $1
+	exit 1;
+}
+
+has grim || die "missing grim"
+has wl-copy || die "missing wl-copy"
+has slurp || die "missing slurp"
+
+grim -g "$(slurp)" $TARGET
+if [ -s $TARGET ]; then
+		wl-copy < $TARGET
+fi