Update README.md

README.md

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+Building this project is not difficult, but the setup prior is. You must have
+OpenCL and SFML development libraries insalled. You must also have OpenCL
+compatible hardware to run it on. 
+
+Papers used:
+
+Efficient Sparse Voxel Octrees, Laine et al.
+
+A fast voxel traversal algorithm for ray tracing, Woo et al.
+
 ![alt tag](https://github.com/MitchellHansen/voxel-raycaster/blob/master/assets/video.gif)
 
 ![alt tag](https://github.com/MitchellHansen/voxel-raycaster/blob/master/assets/screenshot.PNG)