Added a Cloud Fundamentals category and one course (#6401)

* Added a Cloud Fundamentals category and one course

* Update free-courses-en.md

* Updated Heading

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

* Update courses/free-courses-en.md

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

* Update free-courses-en.md

* Updated Course Name

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

* Fixed the C++ heading link

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

courses/free-courses-en.md

@@ -12,6 +12,7 @@
 * [C#](#c-sharp)
 * [C++](#cpp)
 * [Clojure](#clojure)
+* [Cloud Computing](#cloud-computing)
 * [Compilers](#compilers)
 * [CUDA](#cuda)
 * [Dart](#dart)
@@ -241,6 +242,11 @@
 * [Functional Programming with Clojure](http://mooc.fi/courses/2014/clojure/)
 
 
+### Cloud Computing
+
+* [Microsoft Certified: Azure Fundamentals](https://docs.microsoft.com/en-us/learn/certifications/azure-fundamentals/) - Microsoft
+
+
 ### Compilers
 
 * [Stanford's Compilers](https://www.edx.org/course/compilers)