added NLP w transformers for AI/ML interviews

books/free-programming-books-subjects.md

@@ -152,6 +152,8 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Probabilistic Programming & Bayesian Methods for Hackers](https://camdavidsonpilon.github.io/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers/) - Cam Davidson-Pilon (HTML, Jupyter Notebook)
 * [The History of Artificial Intelligence](https://courses.cs.washington.edu/courses/csep590/06au/projects/history-ai.pdf) - Chris Smith, Brian McGuire, Ting Huang, Gary Yang (PDF)
 * [The Quest for Artificial Intelligence: A History of Ideas and Achievements](https://ai.stanford.edu/~nilsson/QAI/qai.pdf) - Nils J. Nilsson (PDF)
+* [Natural Language Processing with Transformers](https://github.com/cyb0rg14/deeplearning/blob/master/book/natural-language-processing-with-transformers-revised-edition.pdf) - Lewis Tunstall, Leandro von Werra & Thomas Wolf (PDF)
+
 
 
 ### Blockchain