Added DSA Codechef Problems Playlist (#9329)

* Added DSA Codechef Problems Playlist

* Updated title

courses/free-courses-en.md

@@ -142,6 +142,7 @@
 * [Berkeley's CS 61B: Data Structures](https://archive.org/details/ucberkeley_webcast_QMV45tHCYNI)
 * [Binary Trees - by LoveBabbar](https://youtube.com/playlist?list=PLDzeHZWIZsTo87y1ytEAqp7wYlEP3nner) - CodeHelp - by Babbar
 * [C Programming & Data Structures](https://youtube.com/playlist?list=PLBlnK6fEyqRhX6r2uhhlubuF5QextdCSM) - Neso Academy
+* [Codechef Solutions](https://www.youtube.com/playlist?list=PLRKOqqzwh75huOam-77G1v9uHjO9WWBRX) - Endeavour Monk
 * [Complete C++ Placement DSA Course](https://www.youtube.com/playlist?list=PLDzeHZWIZsTryvtXdMr6rPh4IDexB5NIA) - CodeHelp - by Babbar
 * [Computer Sc - Programming and Data Structure](https://www.youtube.com/playlist?list=PLD9781AC5EBC9FA16) - P.P. Chakraborty
 * [Data Structure and Algorithm](https://www.youtube.com/playlist?list=PLLvKknWU7N4y_eGpQdg1Y-hORO7cxtoLU) - Lalit Vashistha