Add/update the quantized ONNX model files and README.md for Transformers.js v3 (#2)

[Automated] Update base model metadata

Rename onnx/model.onnx to onnx/decoder_model_merged.onnx

Rename onnx/model_quantized.onnx to onnx/decoder_model_merged_quantized.onnx

Upload folder using huggingface_hub

Upload README.md with huggingface_hub

initial commit