Update free-courses-en.md with Learn Blockchain & Solidity Development Full Course 2024 (#11346)

* Update free-courses-en.md

* Fixed error

* Update free-courses-en.md as per guideline

* Update free-courses-en.md

* Update free-courses-en.md

* Update courses/free-courses-en.md

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

---------

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

courses/free-courses-en.md

@@ -330,6 +330,7 @@
 * [Build and Deploy Your First Decentralized App with Etherem](https://www.udemy.com/course/your-first-decentralized-app/) - Gary Simon (Udemy)
 * [CryptoZombies.io](https://cryptozombies.io) - CleverFlare, Loom Network
 * [Ethereum Developer Bootcamp](https://www.alchemy.com/university/courses/ethereum) - Alchemy University
+* [Free Blockchain Development Courses](https://www.youtube.com/playlist?list=PLS5SEs8ZftgUNcUVXtn2KXiE1Ui9B5UrY) - Dapp University
 * [Learn Blockchain](https://www.youtube.com/playlist?list=PLlp912GlUiC1xPnwVmKgIiuMERetMwre9) - Roomyan
 * [Solidity, Blockchain, and Smart Contract Course – Beginner to Expert Python Tutorial](https://www.youtube.com/watch?v=M576WGiDBdQ) - Patrick Collins (freeCodeCamp.org)