Added Sorting Algorithms Course Playlist By Amulya's Academy(changes-made) (#9703)

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* 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

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 * [Princeton University Algorithms, Part 2](https://www.coursera.org/learn/algorithms-part2)
 * [Red Black Tree in Data Structures](https://youtube.com/playlist?list=PLPzfPcir5uPT8KFST1Ba3vN6k9yKE9ZK4) - NG Tutorials
 * [Sorting Algorithms](https://www.youtube.com/playlist?list=PL2_aWCzGMAwKedT2KfDMB9YA5DgASZb3U) - mycodeschool
+* [Sorting Algorithms](https://www.youtube.com/playlist?list=PLzgPDYo_3xunyLTJlmoH8IAUvet4-Ka0y) - Amulya's Academy
 * [Stanford University Algorithms: Design and Analysis, Part 1](https://online.stanford.edu/courses/soe-ycsalgorithms1-algorithms-design-and-analysis-part-1)
 * [Stanford University Algorithms: Design and Analysis, Part 2](https://online.stanford.edu/courses/soe-ycs0001-algorithms-design-and-analysis-part-2)
 * [Strivers A2Z-DSA Course \| DSA Playlist \| Placements](https://www.youtube.com/playlist?list=PLgUwDviBIf0oF6QL8m22w1hIDC1vJ_BHz) - take U forward