added a book for graphics programming (#4662)

* added a book for graphics programming

* Update free-programming-books.md

Co-authored-by: Seth <seth@elypia.org>

* Update free-programming-books.md

Co-authored-by: Seth <seth@elypia.org>

Co-authored-by: Seth <seth@elypia.org>

free-programming-books.md

@@ -275,6 +275,7 @@
 
 * [3D Game Shaders For Beginners](https://github.com/lettier/3d-game-shaders-for-beginners) - David Lettier (Git) [(HTML)](https://lettier.github.io/3d-game-shaders-for-beginners)
 * [Blender 3D: Noob to Pro](https://en.wikibooks.org/wiki/Blender_3D%3A_Noob_to_Pro) - Wikibooks
+* [Blender Manual](https://docs.blender.org/manual/en/latest)
 * [Computer Graphics from scratch](http://gabrielgambetta.com/computer-graphics-from-scratch) - Gabriel Gambetta (:construction: *in process*)
 * [DirectX manual](http://user.xmission.com/~legalize/book/download/index.html) (draft)
 * [GPU Gems](https://developer.nvidia.com/gpugems/GPUGems/gpugems_pref01.html)