feat: add brother-scand-git

Adds the package for monitoring networked Brother scanners for button
presses.

brother-scand-git/brother-scand.install

@@ -0,0 +1,5 @@
+post_install() {
+	useradd --system --no-create-home brother-scand
+	chown -R brother-scand /etc/brother-scand
+	echo -e "Now edit /etc/brother-scand/scanner.conf. Then run:\n  systemctl restart rsyslog\n  systemctl enable brother-scand"
+}