Merge pull request #551 from paralysedforce/master

Add Ray Tracing in One Weekend

README.md

@@ -44,6 +44,7 @@ It's a great way to learn.
 * [**C++**: _How OpenGL works: software rendering in 500 lines of code_](https://github.com/ssloy/tinyrenderer/wiki)
 * [**C++**: _Raycasting engine of Wolfenstein 3D_](http://lodev.org/cgtutor/raycasting.html)
 * [**C++**: _Physically Based Rendering:From Theory To Implementation_](http://www.pbr-book.org/)
+* [**C++**: _Ray Tracing in One Weekend_](https://raytracing.github.io/books/RayTracingInOneWeekend.html)
 * [**C++**: _Rasterization: a Practical Implementation_](https://www.scratchapixel.com/lessons/3d-basic-rendering/rasterization-practical-implementation/overview-rasterization-algorithm)
 * [**C# / TypeScript / JavaScript**: _Learning how to write a 3D soft engine from scratch in C#, TypeScript or JavaScript_](https://www.davrous.com/2013/06/13/tutorial-series-learning-how-to-write-a-3d-soft-engine-from-scratch-in-c-typescript-or-javascript/)
 * [**Java / JavaScript**: _Build your own 3D renderer_](https://avik-das.github.io/build-your-own-raytracer/)