Update README.md

README.md

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+# Llama.cpp imatrix quantizations of google/gemma-2-2b-it-GGUF
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+<img src="https://cdn-uploads.huggingface.co/production/uploads/646410e04bf9122922289dc7/-03oAOPVN1nZjp6-2EIxD.png" alt="gemma" width="60%"/>
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+Using llama.cpp commit [268c566](https://github.com/ggerganov/llama.cpp/commit/398ede5efeb07b9adf9fbda7ea63f630d476a792) for quantization.
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+Original model: https://huggingface.co/google/gemma-2-2b-it
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+All quants were made using the imatrix option and Bartowski's [calibration file](https://gist.github.com/bartowski1182/eb213dccb3571f863da82e99418f81e8).
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+<hr><br>
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 # Gemma Model Card
 
 **Model Page**: [Gemma](https://ai.google.dev/gemma/docs)