add README

README.md

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+# NeRF Materials Dataset
+
+This contains data for training a NeRF on the `materials` scene from the NeRF paper (Mildenhall et al., 2020), released under the [Creative Commons Attribution 3.0 (CC BY 3.0)](https://creativecommons.org/licenses/by/3.0/) license.
+
+## Download Instructions
+
+```bash
+sudo apt install git-lfs
+git lfs install
+
+git clone https://huggingface.co/datasets/learning3dvision/nerf_materials
+cd nerf_materials
+unzip materials.zip -d <path_to_your_data_folder>
+```