Load test transcript by default

[FelipeJz]

This will allow the program to run the first time when you don't know the code as the "right" save function will fail when no transcript is loaded. This closes #7

[ben9583]

It's possible the user removes the test transcript, in which case this will throw a missing file error. I think the best solution here would be to throw an error that specifically tells the user to input a transcript