chore: Added Nextjs 14 Course (#11315)

* chore: Added Nexjs 14 Course

Signed-off-by: Soorya U <sooryau7@gmail.com>

* Update courses/free-courses-en.md

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

---------

Signed-off-by: Soorya U <sooryau7@gmail.com>
Co-authored-by: Eric Hellman <eric@hellman.net>

courses/free-courses-en.md

@@ -1067,6 +1067,7 @@
 * [Complete Next.js Course For Beginners](https://www.youtube.com/playlist?list=PLynWqC6VC9KOvExUuzhTFsWaxnpP_97BD) - Daily Tuition
 * [Master Next JS by Building Real Projects](https://www.youtube.com/playlist?list=PL6QREj8te1P7gixBDSU8JLvQndTEEX3c3) - JavaScript Mastery
 * [Mastering Next.js](https://masteringnextjs.com)
+* [Next.js 14 Beginner Roadmap & Course](https://www.youtube.com/playlist?list=PLrnPJCHvNZuBH7pax5p75JDNblo8rpl00) - Coding in Flow
 * [Next.js for Beginners - Full Course](https://www.youtube.com/watch?v=1WmNXEVia8I) - Kapehe (FreeCodeCamp)
 * [Next.js Tutorial for Beginners](https://www.youtube.com/playlist?list=PLC3y8-rFHvwgC9mj0qv972IO5DmD-H0ZH) - Codevolution
 * [Next.js Tutorials for Beginners](https://www.youtube.com/playlist?list=PL0Zuz27SZ-6Pk-QJIdGd1tGZEzy9RTgtj) - Dave Gray