chore: add resource under computer-science:pick-a-language:c-plus-plus

src/data/roadmaps/computer-science/content/101-pick-a-language/100-c-plus-plus.md

@@ -6,4 +6,5 @@ Visit the following resources to learn more:
 
 - [Learn Cpp](https://learncpp.com/)
 - [C++ Reference](https://en.cppreference.com/)
-- [C++ TutorialsPoint](https://www.tutorialspoint.com/cplusplus/index.htm)
+- [C++ TutorialsPoint](https://www.tutorialspoint.com/cplusplus/index.htm)
+- [W3Schools C++](https://www.w3schools.com/cpp/default.asp)