Add Python book "Introduction to Scientific Programming" (#8950)

* Added Python book to free-programming-books-langs.md

* Added (PDF) indication

* Update books/free-programming-books-langs.md

Co-authored-by: Eric Hellman <eric@hellman.net>

Co-authored-by: Eric Hellman <eric@hellman.net>

books/free-programming-books-langs.md

@@ -1925,6 +1925,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
     * [Introduction to Programming Using Python](http://python-ebook.blogspot.co.uk) - Cody Jackson (1st edition) (2.3)
 * [Introduction to Python](http://kracekumar.com/post/71171551647/introduction-to-python) - Kracekumar (2.7.3)
 * [Introduction to Python for Econometrics, Statistics and Numerical Analysis](https://www.kevinsheppard.com/files/teaching/python/notes/python_introduction_2020.pdf) - Kevin Sheppard (PDF) (3.8)
+* [Introduction to Scientific Programming with Python](https://library.oapen.org/bitstream/id/56d27e73-e92a-4398-8198-239be7aacc93/2020_Book_IntroductionToScientificProgra.pdf) - Joakim Sundnes (PDF)
 * [Invent Your Own Computer Games With Python](https://inventwithpython.com/invent4thed/) - Al Sweigart (3.4)
 * [Learn Python, Break Python](http://learnpythonbreakpython.com)
 * [Learn Python Programming, Second Edition](https://www.packtpub.com/free-ebooks/learn-python-programming-second-edition) - Fabrizio Romano (Packt account *required*)