added r programming books (#10863)

* added r programming books

* corrected linter error

* corrected error

books/free-programming-books-langs.md

@@ -2156,6 +2156,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Data Mining Algorithms In R](https://en.wikibooks.org/wiki/Data_Mining_Algorithms_In_R) - Wikibooks
 * [Data Visualization with R](https://ladal.edu.au/dviz.html) - Martin Schweinberger (HTML)
 * [Efficient R programming](https://csgillespie.github.io/efficientR/) - Colin Gillespie, Robin Lovelace
+* [Exploratory Data Analysis with R](https://bookdown.org/rdpeng/exdata) - Roger D. Peng
 * [Forecasting: Principles and Practice](https://otexts.com/fpp3/) - Rob J Hyndman, George Athanasopoulos
 * [Functional Programming](https://dcl-prog.stanford.edu) - Sara Altman, Bill Behrman, Hadley Wickham
 * [Geocomputation with R](https://r.geocompx.org) - Robin Lovelace, Jakub Nowosad, Jannes Muenchow
@@ -2163,6 +2164,8 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Learning Statistics with R](https://learningstatisticswithr.com/book/) - Danielle Navarro
 * [Mastering Software Development in R](https://bookdown.org/rdpeng/RProgDA/) - Roger D. Peng, Sean Kross, and Brooke Anderson
 * [Model Estimation by Example, Demonstrations with R](https://m-clark.github.io/models-by-example) - Michael Clark
+* [Modern R with the tidyverse](https://b-rodrigues.github.io/modern_R) - Bruno Rodrigues
+* [Modern Statistics with R](https://www.modernstatisticswithr.com) - Måns Thulin
 * [ModernDive](https://ismayc.github.io/moderndiver-book/) - Chester Ismay, Albert Y. Kim
 * [Practical Regression and Anova using R](http://cran.r-project.org/doc/contrib/Faraway-PRA.pdf) - Julian J. Faraway (PDF)
 * [R for Data Science](https://r4ds.hadley.nz) - Hadley Wickham, Mine Çetinkaya-Rundel, Garrett Grolemund
@@ -2176,6 +2179,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [R Succinctly, Syncfusion](https://www.syncfusion.com/resources/techportal/ebooks/rsuccinctly) (PDF, Kindle) (email address *requested*, not required)
 * [Statistical Inference via Data Science](https://moderndive.com) - Chester Ismay, Albert Y. Kim
 * [Summary and Analysis of Extension Program Evaluation in R](https://rcompanion.org/handbook/index.html) - Salvatore S. Mangiafico
+* [Supervised Machine Learning for Text Analysis in R](https://smltar.com) - Emil Hvitfeldt, Julia Silge
 * [The caret Package](http://topepo.github.io/caret/index.html) - Max Kuhn
 * [The R Inferno](http://www.burns-stat.com/pages/Tutor/R_inferno.pdf) - Patrick Burns (PDF)
 * [The R Language](http://stat.ethz.ch/R-manual/R-patched/doc/html)