Adding A Complete Guide to Standard C++ Algorithms (#6957)

* Adding A Complete Guide to Standard C++ Algorithms

* Update free-programming-books-langs.md

Adjusted description and added a link to the latest PDF on the linked README.md.

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

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

books/free-programming-books-langs.md

@@ -492,6 +492,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 
 ### <a id="cpp"></a>C++
 
+* [A Complete Guide to Standard C++ Algorithms](https://github.com/HappyCerberus/book-cpp-algorithms) - Šimon Tóth (PDF, LaTeX) (:construction: *in process*)
 * [C++ Annotations](https://fbb-git.gitlab.io/cppannotations/) - Frank B. Brokken (HTML, PDF)
 * [C++ Core Guidelines](https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md) - Editors: Bjarne Stroustrup, Herb Sutter
 * [C++ GUI Programming With Qt 3](https://ptgmedia.pearsoncmg.com/images/0131240722/downloads/blanchette_book.pdf) - Jasmin Blanchette, Mark Summerfield (PDF)