fixed error in sampling along ray not allowing proper training, now basic nerf completed

Working training and test inference, but worse than benchmarks

fixed small error in image loading

started training, working on inference

Added basic training code

cleanup and error fixes regarding datatyes

Implemented volume rendering equation

Added network implementation

fixed errors, working code now

stupid error

Implement camera to world transformation, pixel to camera transformation, ray generation, and sampling rays from images

Starting part 2

Restructuring

updated readme with changes

Added a few examples of training results