Added MAUI tutorial/course from Microsoft (#10788)

* Update free-courses-en.md

Added the course Build mobile and desktop apps with .NET MAUI  from Microsoft with James Montemagno

* Update free-courses-en.md to fix lint error

Swapped lines 341 and 342 to fix the alphabetical order lint error for the course I added "Build mobile and desktop apps with .NET MAUI"

courses/free-courses-en.md

@@ -340,6 +340,7 @@
 ### <a id="csharp"></a>C\#
 
 * [ASP.NET Core 2.2 & 3 REST API Tutorial](https://youtube.com/playlist?list=PLUOequmGnXxOgmSDWU7Tl6iQTsOtyjtwU&si=3XHU6BnqwxePAt54) - Nick Chapsas
+* [Build mobile and desktop apps with .NET MAUI](https://learn.microsoft.com/en-us/training/paths/build-apps-with-dotnet-maui) - James Montemagno (Microsoft)
 * [Building a microservice architecture with ASP.NET Core - Gill Cleeren - NDC London 2022](https://www.youtube.com/watch?v=SR53SKIUYPA) - Gill Cleeren
 * [C# 101](https://channel9.msdn.com/Series/CSharp-101) - Scott Hanselman, Kendra Havens (Microsoft)
 * [C# Full Course for free](https://www.youtube.com/watch?v=wxznTygnRfQ) - Bro Code