Add sample slideshow.
Add more information to README
Add pysent script.

The first implementation of the script.

Usage: python pysent.py -i <inputfile>

Input file is a slideshow written in Markdown. Each slide is
separated by a line with at least three dashes. Each slide has
one title, preceded by a '#' sign.

Upon startup, the script displays a full screen of text, which
you then size your console to fit. Afterwards, slides are
navigated through with hits of the Enter key. Basic animations
and ASCII text provided currently.