Update README.md to include environment variable setup instructions

README.md

@@ -12,4 +12,10 @@ hf_oauth: true
 hf_oauth_expiration_minutes: 480
 ---
 
-Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+
+In order to run this template, you need to set the following environment variables in your `.env` file:
+- `OPENAI_API_KEY`: Your OpenAI API key.
+- `LANGFUSE_SECRET_KEY`: Your Langfuse secret key.
+- `LANGFUSE_PUBLIC_KEY`: Your Langfuse public key.
+- `LANGFUSE_HOST`: The host URL for Langfuse, typically `https://cloud.langfuse.com`.