Update README.md

README.md

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 license: apache-2.0
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+This repository contains importance matrix datasets for use with the improved quantization methods recently added to `llama.cpp`.
+
+Hope the names are self-explanatory.
+
+To use, after cloning this repo, for e.g. Mixtral-8x7B and `Q4_K_M` quantization, use
+```
+./quantize --imatrix path_to_repo/mixtral-8x7b.imatrix path_to_model ggml-model-q4k-m.gguf Q4_K_M
+```