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

- Add/update the quantized ONNX model files and README.md for Transformers.js v3 (a702148accb13841cf68e0b3c744927bd90daaf0)


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

onnx/decoder_model_merged_bnb4.onnx

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onnx/decoder_model_merged_fp16.onnx

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onnx/decoder_model_merged_int8.onnx

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onnx/decoder_model_merged_q4.onnx

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onnx/decoder_model_merged_q4f16.onnx

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onnx/decoder_model_merged_uint8.onnx

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