add duckduckgo_search (#3)

- add duckduckgo_search (26a53d16e5595e2bf40df3b6c5508041fcd67dcf)

app.py

@@ -58,7 +58,7 @@ with open("prompts.yaml", 'r') as stream:
     
 agent = CodeAgent(
     model=model,
-    tools=[final_answer, my_custom_tool], ## add your tools here (don't remove final answer)
+    tools=[final_answer, my_custom_tool, duckduckgo_search], ## add your tools here (don't remove final answer)
     max_steps=6,
     verbosity_level=1,
     grammar=None,