Collect and clean Medicare Part B spending data

[mattgawarecki]

Task

Download the Part B spending data from CMS and convert it to an accessible format that's easier to analyze.

How this will help

Part D is a large component of drug spending with respect to Medicare, but Part B is significant, as well. If we incorporate Part B statistics into our decision-making and analyses, we can make comparisons and get a better picture for Medicare drug spending as a whole.

[sgalletta213]

Done! Made a commit for the data and code.

[mattgawarecki]

Closing this issue since we merged #20. Great work, @sgalletta213! 👍