add some initial readme

NeRF/tensorflow/README.md

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+# Neural Radiance Field (NeRF and D-NeRF)
+
+This directory host the source code to replicate two papers
+- NeRF: Representing Scenes as Neural Radiance Fields for View Synthesis, https://arxiv.org/abs/2003.08934
+- Deformable Neural Radiance Fields, https://arxiv.org/abs/2011.12948
+
+## Setup
+
+1. Install python dependencies
+```
+pip install -r requirements.in
+```
+
+2. Install COLMAP. Please visit: https://colmap.github.io/install.html
+
+3. Install ffmpeg. Please visit: https://ffmpeg.org/download.html
+
+## Custom Training Data
+
+To create custom training data, we will use a script `extract_frames.py` to run multiple steps in a pipeline, including blur detection and SfM.
+```
+python extract_frames.py --video=./data/shiba.mp4 --output-dir=./data/shiba/ --threshold=15
+```

NeRF/tensorflow/requirements.in

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+tensorflow==2.4.0