Add Korean free Haskell lecture (#6292)

* Add Korean free Haskell lecture

* Fix lint error

* Fix line blank line error

* Fix line blank line error2

* Update list order

* Delete unnecessary white space

* Update author of lecture

* Move courses to appropriate file

* Update courses/free-courses-ko.md

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

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

courses/free-courses-ko.md

@@ -11,6 +11,7 @@
 * [Flutter](#flutter)
 * [Git](#git)
 * [Go](#go)
+* [Haskell](#haskell)
 * [Introduction](#introduction)
 * [iOS](#ios)
 * [Java](#java)
@@ -112,6 +113,11 @@
 * [컴맹을 위한 프로그래밍 기초 강좌](https://www.youtube.com/playlist?list=PLy-g2fnSzUTAaDcLW7hpq0e8Jlt7Zfgd6)
 
 
+### Haskell
+
+* [하스켈 프로그래밍: 프로그래밍과 유형 이론(Type Theory)](https://www.youtube.com/playlist?list=PL5aSjzJqCaPaoi8yC2w549FsVgvXW5xFW) - Gyesik Lee «liga nega» (YouTube)
+
+
 ### Introduction
 
 * [컴퓨터 프로그래밍](http://www.kocw.net/home/search/kemView.do?kemId=1322410)