Add OCaml Scientific Computing (#5213)

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

books/free-programming-books.md

@@ -2166,6 +2166,7 @@ Kerridge (PDF) (email address *requested*, not required)
 
 * [Developing Applications With Objective Caml](http://caml.inria.fr/pub/docs/oreilly-book/)
 * [Functional Programming in OCaml](https://www.cs.cornell.edu/courses/cs3110/2019sp/textbook/) - Michael R. Clarkson
+* [OCaml Scientific Computing](https://ocaml.xyz/book/) - Liang Wang, Jianxin Zhao (HTML) (:construction: *in process*)
 * [Real World OCaml](https://dev.realworldocaml.org/toc.html)
 * [Think OCaml](http://greenteapress.com/thinkocaml/index.html) - Allen B. Downey and Nicholas Monje
 * [Unix System Programming in OCaml](http://ocaml.github.io/ocamlunix/) [Github Repo](https://github.com/ocaml/ocamlunix/)