Add programming language book "Behavior Analysis with Machine Learning Using R" (#11885)

Author: DavideDunne

books/free-programming-books-langs.md

@@ -2184,6 +2184,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [An Introduction to ggplot2](https://bookdown.org/ozancanozdemir/introduction-to-ggplot2) - Ozancan Ozdemir
 * [An Introduction to R](https://cran.r-project.org/doc/manuals/R-intro.html) - David M. Smith, William N. Venables
 * [An Introduction to Statistical Learning with Applications in R](https://hastie.su.domains/ISLR2/ISLRv2_corrected_June_2023.pdf.view-in-google.html) - Gareth James, Daniela Witten, Trevor Hastie, Robert Tibshirani (PDF)
+* [Behavior Analysis with Machine Learning Using R](https://enriquegit.github.io/behavior-free/) - Enrique Garcia Ceja (HTML)
 * [Beyond Multiple Linear Regression](https://bookdown.org/roback/bookdown-BeyondMLR) - Paul Roback, Julie Legler
 * [blogdown: Creating Websites with R Markdown](https://bookdown.org/yihui/blogdown/) - Yihui Xie, Amber Thomas, Alison Presmanes Hill
 * [Cookbook for R](http://www.cookbook-r.com) - Winston Chang