Update README "Instructions For Students"

[audreyfeldroy]

Just a heads up that I'm adding a big section to "Instructions For Students" in the README with the agenda, links to slides, etc.

The purpose is so they can follow along locally with our slides/notes in case they fall behind.

[willingc]

@audreyr Thanks. Would you mind updating Part 4 to "List comprehensions, Dictionaries, and Tuples"?

[audreyfeldroy]

Sure, will do that @willingc.