Raytracing In A Weekend(Rust)

My initial attempt at implementing raytracing in rust (from Raytracing in A Weekend). This is an almost literal translation from C++ to Rust, which was a pain to write.

Things To-Do (later)

1. Complete re-write in idiomatic rust (once i get a hang of it :/)
2. Parallelism (the .ppm image takes too much time to render)
3. Render more textures and different shapes