Add OTP supervisor for mgw_nat_usr

for some reason it is not working yet :(
diff --git a/src/mgw_nat_sup.erl b/src/mgw_nat_sup.erl
new file mode 100644
index 0000000..f6ac369
--- /dev/null
+++ b/src/mgw_nat_sup.erl
@@ -0,0 +1,42 @@
+% OTP Supervisor for MGW NAT
+
+% (C) 2011 by Harald Welte <laforge@gnumonks.org>
+% (C) 2011 OnWaves
+%
+% All Rights Reserved
+%
+% This program is free software; you can redistribute it and/or modify
+% it under the terms of the GNU Affero General Public License as
+% published by the Free Software Foundation; either version 3 of the
+% License, or (at your option) any later version.
+%
+% This program is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU Affero General Public License
+% along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+-module(mgw_nat_sup).
+-behavior(supervisor).
+
+-export([start_link/0]).
+-export([init/1]).
+
+-define(MSC_LOCAL_IP,		any).
+-define(MSC_LOCAL_PORT,		2904).
+-define(MSC_REMOTE_IP,		{172,16,1,81}).
+-define(STP_REMOTE_IP,		{172,16,249,20}).
+-define(STP_REMOTE_PORT,	2904).
+
+-define(SCTP_HDLR_ARGS,	[?MSC_LOCAL_IP, ?MSC_LOCAL_PORT, ?MSC_REMOTE_IP,
+			 ?STP_REMOTE_IP, ?STP_REMOTE_PORT]).
+
+start_link() ->
+	supervisor:start_link({local, ?MODULE}, ?MODULE, []).
+
+init(_Arg) ->
+	MgwChild = {mgw_nat_usr, {mgw_nat_usr, start_link, ?SCTP_HDLR_ARGS},
+		    permanent, 2000, worker, [mgw_nat_usr, sctp_handler, mgw_nat]},
+	{ok,{{one_for_all,1,1}, [MgwChild]}}.