Add api key information

README.md

@@ -28,7 +28,14 @@ DEMO: https://huggingface.co/spaces/Kadi-IAM/LISA
     pip install -r requirements.txt
     ```
 
-3. Set Up the Knowledge Base
+3. Set enviroment variables (Huggingface for downloading model weights, Tavily for web search and Groq for LLMs):
+    ```bash
+    export HUGGINGFACEHUB_API_TOKEN=your_api_key_here
+    export TAVILY_API_KEY=your_api_key_here
+    export GROQ_API_KEY=your_api_key_here
+    ```
+
+4. Set Up the Knowledge Base
 Populate the knowledge base with relevant documents or research papers. Ensure that documents are in a format (pdf or xml) compatible with the RAG pipeline. By default documents should be located at `data/documents`. After running the following comand, some caches files are saved into `data/db`. ATTENTION: pickle is used to save these caches, be careful with potential security risks.
     ```bash
     python preprocess_documents.py