Update README with HF_TOKEN setup instructions

README.md

@@ -47,6 +47,35 @@ A Retrieval-Augmented Generation (RAG) chatbot for genetic counseling and cascad
 - MediPhi
 - Phi-4-reasoning
 
+## Setup Instructions
+
+### Required: Add HF_TOKEN Secret
+
+This Space uses the Hugging Face Inference API to generate answers. You **must** add your Hugging Face token as a secret:
+
+1. **Get your Hugging Face token:**
+   - Go to: https://huggingface.co/settings/tokens
+   - Create a new token with "Read" permissions
+   - Copy the token
+
+2. **Add token to Space:**
+   - Go to your Space settings: https://huggingface.co/spaces/alrahrooh/cgt-llm-chatbot-v2/settings
+   - Click on "Variables and secrets" tab
+   - Add a new secret:
+     - **Name:** `HF_TOKEN`
+     - **Value:** Your Hugging Face token
+   - Click "Add secret"
+   - Restart the Space (it will restart automatically)
+
+3. **Verify it's working:**
+   - Check the Space logs - you should see "Using Hugging Face Inference API"
+   - Try asking a question in the interface
+
+**Note:** Some models (like Llama) are gated and require you to:
+- Request access at the model's page on Hugging Face
+- Accept the model's license
+- Use a token that has access to the model
+
 ## Important Notes
 
 ⚠️ **This chatbot provides informational answers based on medical literature. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult with qualified healthcare providers for medical decisions.**