initial commit.
initial commit.

It is working:

1. accept commandline options, specify what to serve and which port to
serve
2. use send-udp trick to get the real ipaddr of the server.
3. some pretty output.

Signed-off-by: 夏恺(Xia Kai) <3e0bbecdde3a2d12ad8acfab839778c1b7f26c76@gmail.com>

xiaket/httpd-go