Add tutorial codecrafters-io#74

Author: danistefanovic

README.md

@@ -29,6 +29,7 @@
 
 * [**C++**: *Introduction to Ray Tracing: a Simple Method for Creating 3D Images*](https://www.scratchapixel.com/lessons/3d-basic-rendering/introduction-to-ray-tracing/how-does-it-work)
 * [**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# / 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/)
 * [**Java**: *How to create your own simple 3D render engine in pure Java*](http://blog.rogach.org/2015/08/how-to-create-your-own-simple-3d-render.html)