adding korean translation

README.md

@@ -81,6 +81,8 @@ Thanks [Kenichi Yoneda (Kynd)](https://twitter.com/kyndinfo) and [Sawako](https:
 
 Thanks [Tong Li](https://www.facebook.com/tong.lee.9484) and [Yi Zhang](https://www.facebook.com/archer.zetta?pnref=story) for the [Chinese translation (中文版)](?lan=ch)
 
+Thanks [Jae Hyun Yoo](https://www.facebook.com/fkkcloud) for the Korean [translation (한국어)](?lan=kr)
+
 Thanks [Karim Naaji](http://karim.naaji.fr/) for contributing with support, good ideas and code.
 
 Thanks to everyone who has believed in this project and [contributed with fixes](https://github.com/patriciogonzalezvivo/thebookofshaders/graphs/contributors) or donations.

chap-header.php

@@ -3,7 +3,7 @@
 	echo '
 	<div class="header">
 		<p><a href="http://thebookofshaders.com/">The Book of Shaders</a> by <a href="http://patriciogonzalezvivo.com">Patricio Gonzalez Vivo</a> </p>
-		<p><a href=".">English</a> - <a href="?lan=jp">日本語</a> - <a href="?lan=ch">中文版</a> </p>
+		<p><a href=".">English</a> - <a href="?lan=jp">日本語</a> - <a href="?lan=ch">中文版</a> - <a href="?lan=kr">한국어</a> </p>
 	</div>
 	<hr>
 	';