add intro section

[drewhendrickson]

add intro section

[wkvong]

Hey Drew, is the introduction where we thank the participant for accepting the HIT, and then outline the structure of the study? I'm working on this for my own study now, and if this is want you want in the base experiment, I could probably fix this up later today.

[drewhendrickson]

All of those things would be great to add, I was also thinking of adding something like a disclaimer about it being a psychology experiment and how we use the data. I just pushed a new file into the repo exp/html/intro.html which is an initial draft, feel free to add and modify.