Adding HF API Key call and the login into HF Hub

app.py

@@ -7,6 +7,10 @@ import pandas as pd
 # (Keep Constants as is)
 # --- Constants ---
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
+hf_api_key = os.getenv("huggingface_langchain")
+
+from huggingface_hub import login as hg_hub_login
+hg_hub_login(hf_api_key)
 
 # --- Basic Agent Definition ---
 # ----- THIS IS WERE YOU CAN BUILD WHAT YOU WANT ------