Added Llama install instructions

README.md

@@ -18,6 +18,8 @@ The results are exported in a CSV file, which includes columns specifying the LL
 `cp .env.example .env`
 And enter your open_ai_key
 
+To use the llama-2 models, you first need to apply for access to the llama-2 models via e.g. https://huggingface.co/meta-llama/Llama-2-7b-chat-hf Once accepted, get a hugging face auth token https://huggingface.co/settings/tokens and then run `huggingface-cli login` on the command line, filling in the generated token.
+
 ## Run
 `streamlit run PromptCompass.py`