Added Probabilistic Machine Learning - An Introduction PDF by Kevin P. Murphy (#8470)

* added probabilistic machine learning book check_urls=free-programming-books-subjects.md

* added probabilistic machine learning book check_urls=free-programming-books-subjects.md

* added probabilistic machine learning book check_urls=free-programming-books-subjects.md

books/free-programming-books-subjects.md

@@ -388,6 +388,7 @@ Books that cover a specific programming language can be found in the  [BY PROGRA
 * [Mathematics for Machine Learning](https://mml-book.github.io) - Marc Peter Deisenroth, A Aldo Faisal, Cheng Soon Ong
 * [Neural Networks and Deep Learning](http://neuralnetworksanddeeplearning.com)
 * [Practitioners guide to MLOps](https://services.google.com/fh/files/misc/practitioners_guide_to_mlops_whitepaper.pdf) - Khalid Samala, Jarek Kazmierczak, Donna Schut (PDF)
+* [Probabilistic Machine Learning - An Introduction](https://github.com/probml/pml-book/releases/latest/download/book1.pdf) - Kevin P. Murphy (PDF)
 * [Probabilistic Models in the Study of Language](http://idiom.ucsd.edu/~rlevy/pmsl_textbook/text.html) (Draft, with R code)
 * [Python Machine Learning Projects](https://www.digitalocean.com/community/books/python-machine-learning-projects-a-digitalocean-ebook) - Lisa Tagliaferri, Brian Boucheron, Michelle Morales, Ellie Birkbeck, Alvin Wan (PDF, EPUB, Kindle)
 * [Reinforcement Learning: An Introduction](http://incompleteideas.net/book/RLbook2020.pdf) - Richard S. Sutton, Andrew G. Barto (PDF)