added data science book (#8981)

books/free-programming-books-subjects.md

@@ -251,6 +251,7 @@ Books that cover a specific programming language can be found in the  [BY PROGRA
 * [Data Jujitsu: The Art of Turning Data into Product](http://www.oreilly.com/data/free/data-jujitsu.csp) (email address *requested*, not required)
 * [Data Mining Algorithms In R](https://en.wikibooks.org/wiki/Data_Mining_Algorithms_In_R) - Wikibooks
 * [Elements of Data Science](https://allendowney.github.io/ElementsOfDataScience/README.html) - Allen B. Downey
+* [Foundations of Data Science](https://www.cs.cornell.edu/jeh/book.pdf) - Avrim Blum, John Hopcroft, Ravindran Kannan (PDF)
 * [Fundamentals of Data Visualization](https://clauswilke.com/dataviz/) - Claus O. Wilke (HTML)
 * [Hands-On Data Visualization](https://handsondataviz.org) - Jack Dougherty, Ilya Ilyankou (HTML)
 * [Internet Advertising: An Interplay among Advertisers, Online Publishers, Ad Exchanges and Web Users](http://arxiv.org/pdf/1206.1754v2.pdf) (PDF)