build: implement autoconf

Replace the static Makefile with one that's dynamically generated by an
autoconf configure script.

This allows the module to build and install on RHEL 6.
doc: add README

Add a basic README file with compilation and installation instructions.
Merge pull request #1 from ktdreyer/autoconf

add autoconf support and README

Reviewed-by: Yehuda Sadeh <yehuda@redhat.com>