docs: add readme

README.md

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+# HiFi-GAN
+
+[HiFi-GAN](https://arxiv.org/abs/2010.05646) vocoder trained on the [LJ Speech dataset](https://keithito.com/LJ-Speech-Dataset/). The modeling code is based on the [official implementation](https://github.com/jik876/hifi-gan) and the [fairseq adaptation](https://github.com/pytorch/fairseq).
+
+## Usage
+
+```python
+from transformers import AutoModel
+
+model = AutoModel.from_pretrained("jake/hifigan-lj-v1", trust_remote_code=True)
+```
+