Update usage instructions

README.md

@@ -27,10 +27,10 @@ git clone https://github.com/ml-explore/mlx-examples.git
 
 # Download model
 export HF_HUB_ENABLE_HF_TRANSFER=1
-huggingface-cli download --local-dir models --local-dir-use-symlinks False mlx-llama/CodeLlama-7b-mlx CodeLlama-7b-mlx
+huggingface-cli download --local-dir CodeLlama-7b-mlx mlx-llama/CodeLlama-7b-mlx
 
 # Run example
-python mlx-examples/llama/llama.py CodeLlama-7b-mlx CodeLlama-7b-mlx/tokenizer.model "My name is "
+python mlx-examples/llama/llama.py CodeLlama-7b-mlx/CodeLlama-7b.npz CodeLlama-7b-mlx/tokenizer.model "def fibonacci("
 ```
 
 Please, refer to the [original model card](https://github.com/facebookresearch/codellama/blob/main/MODEL_CARD.md) for details on CodeLlama.