Update free-programming-books-langs.md (#9009)

Add Monte Carlo's "Building Data Products: The Ultimate Guide"

books/free-programming-books-langs.md

@@ -1894,6 +1894,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [Beyond the Basic Stuff with Python](https://inventwithpython.com/beyond/) - Al Sweigart (3.x)
 * [Biopython Tutorial and Cookbook](https://biopython.org/DIST/docs/tutorial/Tutorial.pdf) (PDF)
 * [Build applications in Python the antitextbook](http://github.com/thewhitetulip/build-app-with-python-antitextbook) (3.x) (HTML, PDF, EPUB, Mobi)
+* [Building Data Products: The Ultimate Guide](https://resources.montecarlodata.com/c/ebook-building-data-products?x=gEwOdf) (HTML, EPUB)
 * [Building Skills in Object-Oriented Design, V4](https://slott56.github.io/building-skills-oo-design-book/build/html/) - Steven F. Lott (3.7)
     * [Building Skills in Object-Oriented Design, Release 2.2.1](https://web.archive.org/web/20150824204101/http://buildingskills.itmaybeahack.com/book/oodesign-python-2.2/latex/BuildingSkillsinOODesign.pdf) - Steven F. Lott (PDF) (2.2.1)
     * [Building Skills in Object-Oriented Design, Release 3.1](https://web.archive.org/web/20160322093622/http://buildingskills.itmaybeahack.com/book/oodesign-3.1/latex/BuildingSkillsinObject-OrientedDesign.pdf) - Steven F. Lott (PDF) (3.1)