Add simple README

Adds simple readme for people unfamiliar with middleman to run their own version of the curriculum site.

closes #10
Rename Pip to pip

The pip project uses lowercase letters. However, this is weird in writing so I added markdown code ticks to render it in the code font which should draw the eye that these blocks are talking about the program.
Merge pull request #29 from waynegraham/feature/rename_pip

Rename Pip to pip
Merge pull request #28 from waynegraham/feature/add_readme

Add simple README