Merge pull request justjavac#639 from QianMo/patch-1

添加电子书“《Real-Time Rendering 3rd》提炼总结”

Author: justjavac

README.md

@@ -135,6 +135,7 @@
 ## 计算机图形学
 * [OpenGL 教程](https://github.com/zilongshanren/opengl-tutorials)
 * [WebGL自学网](http://html5.iii.org.tw/course/webgl/)
+* [《Real-Time Rendering 3rd》提炼总结](https://github.com/QianMo/Real-Time-Rendering-3rd-Summary-Ebook)
 
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