[WIP] a csv lesson

[elainewong]

Here's a rough sketch of what the using the csv module lesson might look like. More than happy to continue polishing this or tweaking this into an existing lesson.

[drjwbaker]

@cmacdonell Are you on PRs for this lesson?

[richyvk]

@drjwbaker we are having a Python lesson chat on Monday and Thursday. This lesson is part of what I want to talk about - it's future basically.

During the sprint we discussed turning it into a 'working with tabular data in python' sort of thing. Pandas, csv module, etc.

Hopefully we'll get some consensus on how the lesson should progress after the meetings.