atftp: add init script and config file

Signed-off-by: Russell Senior <russell@personaltelco.net>

net/atftp/files/atftpd.init

@@ -0,0 +1,17 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2020 OpenWrt.org
+
+START=95
+PIDFILE=/tmp/run/atftpd.pid
+
+start() {
+	config_load atftpd
+	config_get SRV service path "/srv/tftp"
+	config_get PORT service port 69
+
+	atftpd --pidfile $PIDFILE --user root.root --port $PORT --daemon $SRV
+}
+
+stop() {
+	kill $(cat $PIDFILE)
+}