Add authors in "Graphics Programming" section (#2383) (#2619)

free-programming-books.md

@@ -237,13 +237,13 @@
 * [Blender 3D: Noob to Pro](https://en.wikibooks.org/wiki/Blender_3D%3A_Noob_to_Pro)
 * [DirectX manual](http://user.xmission.com/~legalize/book/download/index.html) (draft)
 * [GPU Gems](https://developer.nvidia.com/gpugems/GPUGems/gpugems_pref01.html)
-* [Graphics Programming Black Book](http://www.gamedev.net/page/resources/_/technical/graphics-programming-and-theory/graphics-programming-black-book-r1698)
+* [Graphics Programming Black Book](http://www.gamedev.net/page/resources/_/technical/graphics-programming-and-theory/graphics-programming-black-book-r1698) - Michael Abrash
 * [Introduction to Modern OpenGL](https://open.gl)
 * [Learn OpenGL](http://learnopengl.com) - Joey de Vries
-* [Learning Modern 3D Graphics Programming](https://web.archive.org/web/20150225192611/http://www.arcsynthesis.org/gltut/index.html) (draft)
+* [Learning Modern 3D Graphics Programming](https://web.archive.org/web/20150225192611/http://www.arcsynthesis.org/gltut/index.html) - Jason L. McKesson (draft)
 * [OpenGL](http://www.songho.ca/opengl/index.html) - Concepts and illustrations.
-* [OpenGL Programming Guide (The Red Book)](https://www.ics.uci.edu/~gopi/CS211B/opengl_programming_guide_8th_edition.pdf) (PDF)
-* [ShaderX series](http://www.realtimerendering.com/resources/shaderx/)
+* [OpenGL Programming Guide (The Red Book)](https://www.ics.uci.edu/~gopi/CS211B/opengl_programming_guide_8th_edition.pdf) - Dave Shreiner, Graham Sellers, John Kessenich and Bill Licea-Kane (PDF)
+* [ShaderX series](http://www.realtimerendering.com/resources/shaderx/) - Wolfgang Engel
 * [Tutorials for modern OpenGL](http://www.opengl-tutorial.org)