Add/update the quantized ONNX model files and README.md for Transformers.js v3 (#6)

- Add/update the quantized ONNX model files and README.md for Transformers.js v3 (6cf7b7f71400dc891fa3f2cb90b1e3709f3ca207)


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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