docs: methodology

[Akuukis]

Great stuff! I'm planning to use API for my dashboard Pandemic Estimator but I wish your API had a better documentation on methodology. I'm using JHU directly and I know what chaos it is, the most blatant example being that they provide "cumulative data" that's not cumulative quite often in practice. And the whole change of file formats, etc.

Can you please describe methodology how you deal with it? What's from JHU and what's from CSBS? What has been omitted, what has been "adjusted" and how? Thank you!

[tomo-one]

Nice site.

[sumsur]

This is great!