Add snapshot_download import from huggingface_hub

app.py

@@ -16,6 +16,7 @@ from google.adk.agents import Agent
 from google.adk.tools import google_search, built_in_code_execution
 from google.adk.agents import LlmAgent
 
+from huggingface_hub import snapshot_download
 from openpyxl import load_workbook
 
 import warnings