(Changes made) Added C++ Object-Oriented Programming Course by CodeBeauty (#9747)

* Update free-courses-en.md

Added introductory OOPs tutorial by Saldina Nurak from freecodecamp YouTube channel

* Changes made OOP in C++ by Saldina Nurak

Changes made in OOP in C++ course by Saldina Nurak from CodeBeauty YouTube Channel. Adding the playlist in place of the video.

* Changes made

addressed formatting issue

* Addressed Alphabetical order

* Added Playlist link

Changed the link from video to the playlist

courses/free-courses-en.md

@@ -334,6 +334,7 @@
 * [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)
+* [C++ Object-Oriented Programming](https://www.youtube.com/playlist?list=PL43pGnjiVwgTJg7uz8KUGdXRdGKE0W_jN) - Saldina Nurak (CodeBeauty)
 * [C++ Programming](https://www.youtube.com/playlist?list=PLBlnK6fEyqRh6isJ01MBnbNpV3ZsktSyS) - Neso Academy
 * [C++ Programming](https://www.youtube.com/playlist?list=PLfu_Bpi_zcDOtpXhhxL-P1wu0VkwNRXwC) - Kody Simpson
 * [C++ Programming Course - Beginner to Advanced](https://www.youtube.com/watch?v=8jLOx1hD3_o) - Daniel Gakwaya (freeCodeCamp)