Add temporary docs for GGUF model conversion

Author: abetlen

README.md

@@ -18,7 +18,7 @@ This package provides:
 Documentation is available at [https://llama-cpp-python.readthedocs.io/en/latest](https://llama-cpp-python.readthedocs.io/en/latest).
 
 > [!WARNING]  
-> Starting with version 0.1.79 the model format has changed from `ggmlv3` to `gguf`
+> Starting with version 0.1.79 the model format has changed from `ggmlv3` to `gguf`. Old model files can be converted using the `convert-llama-ggmlv3-to-gguf.py` script in [`llama.cpp`](https://github.com/ggerganov/llama.cpp)
 
 
 ## Installation from PyPI (recommended)