updated readme

.gitignore

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 build/**
+build_*/**
 .build/**
 
 models/**

README.md

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 # llama.cpp
 
-This repo is cloned from llama.cpp [commit 74d73dc85cc2057446bf63cc37ff649ae7cebd80](https://github.com/ggerganov/llama.cpp/tree/74d73dc85cc2057446bf63cc37ff649ae7cebd80). It is compatible with llama-cpp-python [commit 7ecdd944624cbd49e4af0a5ce1aa402607d58dcc](https://github.com/abetlen/llama-cpp-python/commit/7ecdd944624cbd49e4af0a5ce1aa402607d58dcc)
+This repo is cloned from llama.cpp [commit 74d73dc85cc2057446bf63cc37ff649ae7cebd80](https://github.com/ggerganov/llama.cpp/tree/74d73dc85cc2057446bf63cc37ff649ae7cebd80). It is compatible with llama-cpp-python [commit 7ecdd944624cbd49e4af0a5ce1aa402607d58dcc](https://github.com/abetlen/llama-cpp-python/commit/7ecdd944624cbd49e4af0a5ce1aa402607d58dcc)
+
+## Customize quantization group size at compilation (CPU inference only)
+
+The only thing that is different is to add -DQK4_0 flag when cmake.
+
+```bash
+cmake -B build_cpu_g128 -DQK4_0=128
+cmake --build build_cpu_g128
+```
+
+To quantize the model with the customized group size, run
+
+```bash
+./build_cpu_g128/bin/llama-quantize <model_path.gguf> <quantization_type>
+```
+
+To run the quantized model, run
+
+```bash
+./build_cpu_g128/bin/llama-cli -m <quantized_model_path.gguf>
+```
+
+### Note:
+
+You should make sure that the model you run is quantized to the same group size as the one you compile with.
+Or you'll receive a runtime error when loading the model.