Add Tier One, Projectile Motion 1 notebook

[wtbarnes]

This notebook introduces the concepts of data structures, iteration, and conditionals through a simple projectile motion example. My tentative plan,

• Intro to topic/goals for module
• Some very basic and brief theory to lay the groundwork
• Jump in to using Python as a calculator and storing data
• Iteration/conditionals to calculate some quantity for many inputs
• How NumPy makes our life easier
• Hands-on activity
  • Calculate (x,y) for many different launch angles
  • Store these in some data structure formatted in a certain way
  • Pass these off to a plotting routine (that we've written) to create a nice (perhaps animated?!) visualization

This roadmap is very tentative. Still lots of work to do here. Feel free to comment and/or criticize. Once I've finished a full draft, we can iterate on it a few times until we get something we are all comfortable with merging.

NOTE: Remember that the version rendered by GitHub is often really mangled. Don't judge my formatting/style based on how it renders here! Go to nbviewer.

I've also added a TOC to the README for organizational purposes. We can come up with a fancier organizing tool later.