Add main src file for the project.

Most of the functionality of this application will be incorporated
in this file. It will also contain main and act as the entry point
for running the application.
Add a Makefile to the project.
Implement basic packet sniffer functionality.

Alright I got a little lazy with commits. At this point the
sniffer will dump IPv4 TCP traffic to the command line. Still
need to check against wireshark to make sure that it matches up.