Clarify settings, quantization level in README

README.md

@@ -13,6 +13,6 @@ tags:
 
 This model [DeProgrammer/Jan-v3-4B-base-instruct-MNN](https://huggingface.co/DeProgrammer/Jan-v3-4B-base-instruct-MNN) was
 converted to MNN format from [janhq/Jan-v3-4B-base-instruct](https://huggingface.co/janhq/Jan-v3-4B-base-instruct)
-using [llmexport.py](https://github.com/alibaba/MNN/issues/4153#issuecomment-3866182869) in [MNN version **3.4.0**](https://github.com/alibaba/MNN/commit/a874b302f094599e2838a9186e5ce2cf6a81a7a7).
+using [llmexport.py](https://github.com/alibaba/MNN/issues/4153#issuecomment-3866182869) in [MNN version **3.4.0**](https://github.com/alibaba/MNN/commit/a874b302f094599e2838a9186e5ce2cf6a81a7a7) with default settings (4-bit quantization).
 
-Inference can be run via MNN, e.g., MNN Chat on Android.
+Inference can be run via MNN, e.g., MNN Chat on Android.