Add Ballerina language resources for free courses (EbookFoundation#9523)

* Add Ballerina language resources for free courses

* Fix ordering of the courses

* Fix line number issues of the courses

* Fix line number issues of the courses

* Fix the titles

* Fix the titles

* Fix the order

Author: anupama-pathirage

courses/free-courses-en.md

@@ -7,6 +7,7 @@
 * [Artificial Intelligence](#artificial-intelligence)
 * [Assembly](#assembly)
 * [AutoIt](#autoit)
+* [Ballerina](#ballerina)
 * [Bash / Shell](#bash--shell)
 * [Blockchain](#blockchain)
 * [C](#c)
@@ -259,6 +260,18 @@
 * [AutoIt Tutorials](https://www.youtube.com/playlist?list=PL1DCD109B801D0DE6) - 403forbidden403
 
 
+### Ballerina 
+
+* [[Introductory]Integration with Ballerina](https://www.youtube.com/playlist?list=PL7JOecNWBb0KTB3vBz9Dkpc676HzhEDkN) - Shafreen Anfer
+* [Ballerina Code to Cloud](https://www.youtube.com/playlist?list=PL7JOecNWBb0I1YcKwNEyMewhiSvwhM4in) - Anjana Supun
+* [Ballerina Integrated Query Basics](https://www.youtube.com/playlist?list=PL7JOecNWBb0Lld0QfwGW4EKZEoeduyHKD) - Sasindu Alahakoon
+* [Ballerina Programming Language Basics](https://www.youtube.com/playlist?list=PL7JOecNWBb0L4CCqT3awXQUgf6Djl-Oxg) - Sasindu Alahakoon
+* [Ballerina Tables Basics](https://www.youtube.com/playlist?list=PL7JOecNWBb0K--nPJCEQILMt4ZlpkfvHU) - Sasindu Alahakoon
+* [Package Management in Ballerina](https://www.youtube.com/playlist?list=PL7JOecNWBb0LjuZZ8OXzN5apFqlCb6tnY) - Asma Jabir
+* [Testing in Ballerina](https://www.youtube.com/playlist?list=PL7JOecNWBb0ISsKnSaDjv0IIID-ztuu43) - Fathima Dilhasha
+* [XML Manipulation in Ballerina](https://www.youtube.com/playlist?list=PL7JOecNWBb0JxniVXOwROaeFRlDvGd6nj) - Gimantha Bandara
+
+
 ### Bash / Shell
 
 * [Bash Basics for Cloud Computing](https://www.udemy.com/course/bash-basics-for-cloud-computing/) - Kumulus Technologies (Udemy)