add missing files

bin/dump-config

@@ -0,0 +1,14 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+use Martnet::DDNS;
+use JSON::PP qw/encode_json/;
+
+my $ddns = Martnet::DDNS->new();
+my $cfg = $ddns->get_config();
+
+my $json = JSON::PP->new->canonical(1)->pretty(1);
+print $json->encode($cfg);
+
+exit 0;