Many changes

Added a README.md, let me know if the steps aren't similar to what you did or aren't the most efficient.
Added an experiment.html and experient() to test out modifying and saving an existing test using forms. Seems to work but I had trouble routing with <string:id> so that needs to be improved since you can only modify one test right now.

Also routes.py has #!test_tracker/bin/python which is specific to my env so you need to modify or remove that (note in the README). Also if you know a generic way of handling which interpreter gets used, that would be good to fix that.

And I added numbering to the test steps, although the styling is done in the html as I wasn't sure how to do that in the css.