Add CppHints.com to useful websites

Author: marina-makarova

README.md

@@ -705,6 +705,7 @@ A curated list of awesome C/C++ frameworks, libraries, resources, and shiny thin
 * [Meeting C++](http://meetingcpp.com/)
 * [C++ Quiz](http://q.viva64.com/) - C++ quiz in which you propose to find errors in code fragments of open source projects.
 * [Udemy C++ Courses and Tutorials](https://www.udemy.com/topic/C-plus-plus-tutorials/)
+* [C++ Hints](http://cpphints.com/) - Every business day hints about most often C/C++ mistakes and ways to solve them from PVS-Studio Team.
 
 ## Weblogs
 *Useful C/C++ related weblogs.*