(Revised): [HacktoberFest2023]: Added Hacking C++ cheatsheets and infographics page under C++ cheatsheets (#10509)

* [HacktoberFest2023]: Added Hacking C++ cheatsheets and infographics page

* [HacktoberFest2023]: Addressed review comments for Cheatsheets and Infographics under section C++

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

* (Revised) [HacktoberFest2023]: Addressed review comments for cheatsheets and infographics under C++ cheatsheets.

---------

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

more/free-programming-cheatsheets.md

@@ -96,6 +96,7 @@
 
 * [C++ Cheatsheet](https://www.codewithharry.com/blogpost/cpp-cheatsheet) - CodeWithHarry (HTML)
 * [C++ Quick Reference](http://www.hoomanb.com/cs/quickref/CppQuickRef.pdf) - Hooman Baradaran (PDF)
+* [Cheatsheets & Infographics](https://hackingcpp.com/cpp/cheat_sheets.html) - Hacking C++ (HTML & downloadable as PNG)
 * [MPI Cheat Sheet](https://wtpc.github.io/clases/2018/mpicheatsheet.pdf) - SC Education (PDF)
 * [OpenMP 4.0 API C/C++ Syntax Quick Reference Card](https://www.openmp.org/wp-content/uploads/OpenMP-4.0-C.pdf) (PDF)