Add "Fortran Lecture notes from a class"

Fortran. Lecture notes from a class (2020)
By: Paul Tackley

http://jupiter.ethz.ch/~pjt/fortran/FortranClass.html

Part of: EbookFoundation/free-programminfree-programming-books#5492

books/free-programming-books.md

@@ -1461,6 +1461,7 @@ Kerridge (PDF) (email address *requested*, not required)
 ### Fortran
 
 * [Fortran Wiki - Tutorials](http://fortranwiki.org/fortran/show/Tutorials) (HTML)
+* [Fortran. Lecture notes from a class (2020)](http://jupiter.ethz.ch/~pjt/fortran/FortranClass.html) Paul Tackley (HTML)
 * [Introduction to Fortran](https://qc2-teaching.readthedocs.io/en/latest/programming.html) - Sebastian Ehlert, Julius Stückrath, Marcel Mueller, Marcel Stahn (HTML)
 * [Modern Fortran in Science and Technology](https://modern-fortran-in-science-and-technology.readthedocs.io/en/latest) - Jonas Lindemann and Ola Dahlblom (HTML, [PDF](https://modern-fortran-in-science-and-technology.readthedocs.io/_/downloads/en/latest/pdf/), [EPUB](https://modern-fortran-in-science-and-technology.readthedocs.io/_/downloads/en/latest/epub/))
 * [Modern Fortran Tutorial](https://masuday.github.io/fortran_tutorial/) - Yutaka Masuda (HTML)