Added courses for Bun Js in free-courses-en.md (#10380)

* Update free-courses-en.md

Added free courses

Added free courses for Bun Js - Bun is a JavaScript runtime, package manager, test runner bundler built from scratch using the Zig programming language.

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* Added playlist type course for Bun Js

* playlist

* move to javascript

---------

Co-authored-by: Eric Hellman <eric@hellman.net>

courses/free-courses-en.md

@@ -929,6 +929,7 @@
 * [Asynchronous Programming: The End of The Loop](https://egghead.io/courses/asynchronous-programming-the-end-of-the-loop) - Jafar Husain
 * [Beginner's Series to: JavaScript](https://youtube.com/playlist?list=PLlrxD0HtieHhW0NCG7M536uHGOtJ95Ut2) - Microsoft Developer
 * [Bento JavaScript Learning Track](https://bento.io/topic/javascript) (Bento)
+* [Bun JS Tutorials for Beginners](https://www.youtube.com/playlist?list=PLT8tjCYKynKsXBrCf7KiQ6Y-6U304DjXT) - TechWebDocs
 * [Creative Coding for Complete Beginners](https://youtube.com/playlist?list=PLUG_f-krxzVrRCOjGFwOuYj3QarVfPWXK) - Algorithmic Art
 * [Cycle.js Fundamentals](https://egghead.io/courses/cycle-js-fundamentals) - André Staltz
 * [ES6 and Typescript Tutorial](https://www.youtube.com/playlist?list=PLC3y8-rFHvwhI0V5mE9Vu6Nm-nap8EcjV) - Codevolution, Vishwas Gopinath