Section1 material

So I've added my little test following lectures 5 & 6 as I watched it.
It's pretty much the same as in the lecture.
It's called Sandbox_001 because I made it back in lecture 1 or whatever
when the speaker created his sandbox, and renaming these things can be a
bitch.
Merge pull request #4 from coop-mode/section1-exercise-itamar

Adding the first exercise. Yay!