Add Domain Driven Refactoring course to Courses (#7568)

* Add nice ddd course to courses

* Remove .vs folder and files.

* Update free-courses-en.md

Provided changes as requested.

Co-authored-by: Tom <t.baten@sigmax.nl>

courses/free-courses-en.md

@@ -255,6 +255,7 @@
 * [C# Programming Language (Console Applications)](https://youtube.com/playlist?list=PLX07l0qxoHFLZftsVKyj3k9kfMca2uaPR) - Learning Never Ends (YouTube)
 * [C# Tutorial - Full Course for Beginners](https://www.youtube.com/watch?v=GhQdlIFylQ8) - Mike Dane (freeCodeCamp)
 * [C# Tutorial For Beginners - Learn C# Basics in 1 Hour](https://www.youtube.com/watch?v=gfkTfcpWqAY) - Moshfegh Hamedani (Programming with Mosh)
+* [Domain-Driven Refactoring - Jimmy Bogard - NDC London 2022](https://www.youtube.com/watch?v=f64tZ90Dntg) - Jimmy Bogard
 * [Learn how to program: C# and .NET](https://www.learnhowtoprogram.com/c-and-net) - Epicodus Inc.