refactor(courses): Add AI category

Add  `Artificial Intelligence` section suggested in EbookFoundation#5569 (comment)

Resolves EbookFoundation#5569
Locks Resolves EbookFoundation#5569

Author: davorpa

Diff for: courses/free-courses-en.md

@@ -3,6 +3,7 @@
 * [0 - MOOC](#0---mooc)
 * [Algorithms & Data Structures](#algorithms--data-structures)
 * [Android](#android)
+* [Artificial Intelligence](#artificial-intelligence)
 * [Assembly](#assembly)
 * [AutoIt](#autoit)
 * [Bash / Shell](#bash--shell)
@@ -144,6 +145,11 @@
 * [Programming Mobile Services for Android Handheld Systems: Concurrency](https://www.coursera.org/course/posaconcurrency)
 
 
+### Artificial Intelligence
+
+<!-- Waiting to add in -->
+
+
 ### Assembly
 
 * [Binary Exploitation / Memory Corruption by LiveOverflow](https://www.youtube.com/playlist?list=PLhixgUqwRTjxglIswKp9mpkfPNfHkzyeN) - LiveOverflow (YouTube)
@@ -622,7 +628,7 @@
 * [Introduction to Reinforcement Learning with David Silver](https://deepmind.com/learning-resources/-introduction-reinforcement-learning-david-silver) - David Silver
 * [LouvainX Paradigms of Computer Programming – Abstraction and Concurrency](https://www.edx.org/course/paradigms-computer-programming-louvainx-louv1-2x-1#!)
 * [LouvainX Paradigms of Computer Programming – Fundamentals](https://www.edx.org/course/paradigms-computer-programming-louvainx-louv1-1x-1)
-* [Made with ML](https://madewithml.com) - Goku Mohandas (Applied ML · MLOps · Production) 
+* [Made with ML](https://madewithml.com) - Goku Mohandas (Applied ML · MLOps · Production)
 * [MIT 6.S099: Artificial General Intelligence](https://agi.mit.edu)
 * [MIT Numerical Methods (2014)](http://www.iitg.ernet.in/kartha/CE601-14/CourseSchedule.htm)
 * [MIT's Artificial Intelligence](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-034-artificial-intelligence-fall-2010/)