Add Django and Flash playlists to `free-courses-ko.md` (#7010)

* Update free-courses-ko.md

* Update free-courses-ko.md

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

courses/free-courses-ko.md

@@ -28,6 +28,8 @@
 * [Operation System](#operation-system)
 * [PHP](#php)
 * [Python](#python)
+    * [Django](#django)
+    * [Flask](#flask)
 * [Raspberry Pi](#raspberry-pi)
 * [Reinforced Learning](#reinforced-learning)
 * [Ruby](#ruby)
@@ -218,6 +220,16 @@
 * [Python 입문자용 초급](https://www.youtube.com/playlist?list=PLRx0vPvlEmdD8u2rzxmQ-L97jHTHiiDdy)
 
 
+#### Django
+
+* [Python Django Web Framework](https://youtube.com/playlist?list=PLuHgQVnccGMDLp4GH-rgQhVKqqZawlNwG) - 생활코딩
+
+
+#### Flask
+
+* [Python Flask Web Framework](https://youtube.com/playlist?list=PLuHgQVnccGMClNOIuT3b3M4YZjxmult2y) - 생활코딩
+
+
 ### Raspberry Pi
 
 * [라즈베리 파이](https://www.youtube.com/playlist?list=PL0Vl139pNHbc0ypjIuxUJuK-IPld0YmLO)