Create an example and update the README.

The README bothered me for being damn near unreadable. The REPL bit is still
hard, but now there's some example code and _that_ at least is more simple to
read.

Signed-off-by: Brian L. Troutwine <brian@troutwine.us>
Merge pull request #5 from blt/better_examples

Create an example and update the README.