Added a file for the introduction portion of the day.

Hi folks (I wonder who sees this?). 

As we talked about, I have added an introduction section here for the first part of the first day. My idea is to present the schedule and maybe go over an example ('a day in the life of a cognitive neuroscientist') to say how these things play into my own day-to-day life.

This is still WIP - I still need to add some technical instructions at the bottom of this - how to get the repo on their machine and so forth.  

We should also think about how to use this time to verify that everyone is ready to get going. That is, that the installation has completed and everyone is ready to dive into the first session. 

But I thought that I would put this PR in place, so that we can go ahead and merge this into the branch for our boot-camp (note that this PR is *not* against master, but against our stanford specific branch!).