Add shader tutorials (#73)

Author: ShadowMitia

resources/index.html

@@ -59,6 +59,10 @@
 		* [Brendan Galea's Vulkan Game Engine series](https://www.youtube.com/watch?v=Y9U9IE0gVHA&list=PL8327DO66nu9qYVKLDmdLW_84-yE4auCR)
 
 		# Shader Programming
+		
+		## Tutorials
+		* [Shaders For Game Devs by Freya Holmér](https://www.youtube.com/playlist?list=PLImQaTpSAdsCnJon-Eir92SZMl7tPBS4Z)
+		* [The Art of Code shader tutorials](https://www.youtube.com/c/TheArtofCodeIsCool)
 
 		## Guides
 		* [3D Game Shaders for Beginners](https://github.com/lettier/3d-game-shaders-for-beginners)