Attributions added

README.md

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 # NFL-Datasets
 Repo for all NFL Data used in my lesson plan
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+Collection of data found from many locations online. 
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+Resources
+https://blog.cheapism.com/nfl-beer-price-17508/
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+data provided by Team Marketing Report.
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+https://en.wikipedia.org/wiki/List_of_current_National_Football_League_stadiums
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+http://www.espn.com/nfl/story/_/id/15560867/atlanta-falcons-offer-lowest-concession-prices-major-team-sports-new-mercedes-benz-stadium
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+https://www.pro-football-reference.com/years/2015/#team_scoring