Update free-courses-en.md (#10156)

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

courses/free-courses-en.md

@@ -339,6 +339,7 @@
 
 ### <a id="cpp"></a>C++
 
+* [An Introduction to C++ Programming](https://www.udemy.com/course/an-introduction-to-cpp-programming/) - (Udemy)
 * [C++](https://www.youtube.com/playlist?list=PLlrATfBNZ98dudnM48yfGUldqGD0S4FFb) - The Cherno
 * [C++ Compilation, Linking, and Makefiles](https://youtube.com/playlist?list=PLNUvpxaaFJ_i6BYqbxTVeK5AOcFzQbboQ) - Amy Larson
 * [C++ For Programmers](https://www.udacity.com/course/c-for-programmers--ud210) - Catherine Gamboa (Udacity)