added a first version of rc script for freebsd

hostchecker.rc

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+. /etc/rc.subr
+
+name=hostchecker
+rcvar=hostchecker_enable
+
+command="/usr/local/bin/${name}" 
+
+load_rc_config $name
+run_rc_command "$1"