Add documentation

README.md

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+# NeRF Tutorial
+
+This example code is largely inspried from the Jupyter Notebook given by 
+https://github.com/facebookresearch/pytorch3d/blob/master/docs/tutorials/fit_simple_neural_radiance_field.ipynb
+
+It has been adapted to be ran inside a python sheel and not a jupyer notebook.
+It is GPU only, there is support for CPU.
+
+It cannot run my lab computer: NVIDIA GeForce RTX 2060 (6GiB of VRAM)
+and thus need to be run on the cluster which has more VRAM.