Add/update the quantized ONNX model files and README.md for Transformers.js v3 (#1)

- Add/update the quantized ONNX model files and README.md for Transformers.js v3 (aaf6fff0153339cdca2d7fb5f2226530d5e6f313)


Co-authored-by: Yuichiro Tachibana <[email protected]>

onnx/model_bnb4.onnx

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onnx/model_q4.onnx

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onnx/model_q4f16.onnx

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onnx/model_uint8.onnx

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