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 (1ab752b8ab0bef9ddcb58a9f4069e9a7dc6386bc)


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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