Added python game development course (#7557)

* Added python game development course

* lint: alphabetize

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

courses/free-courses-en.md

@@ -457,6 +457,7 @@
 * [Make a Platform Shooter - GameMaker Studio 2](https://www.youtube.com/playlist?list=PL9FzW-m48fn3Ya8QUTsqU-SU6-UGEqhx6) - HeartBeast
 * [Multiplayer Shooter Tutorials - Godot](https://www.youtube.com/playlist?list=PL6bQeQE-ybqDmGuN7Nz4ZbTAqyCMyEHQa) - PlugWorld
 * [Platform Game Development w/ Construct 2](https://www.youtube.com/playlist?list=PL6gx4Cwl9DGAp287UuTE0-K7Ty-b8rGAX) - thenewboston
+* [Pygame (Python Game Development)](https://www.youtube.com/playlist?list=PL6gx4Cwl9DGAjkwJocj7vlc_mFU-4wXJq) - thenewboston
 * [Run Bunny, Run! Creating a 2D game in Unity](https://www.youtube.com/playlist?list=PLvUqRm2B9RRBgJipfDmFR7sFhEwBn7aGT) - Rabidgremlin
 * [Unity Beginner Fundamentals](https://learn.unity.com/course/unity-beginner-fundamentals) - Pluralsight Company (Unity Learn)
 * [Unity Beginner Tutorials](https://www.youtube.com/playlist?list=PLPV2KyIb3jR5QFsefuO2RlAgWEz6EvVi6) (Brackeys)