2. Add tools, agent with tools created and functionnal

+ Small clean up on main.py

README.md

@@ -6,6 +6,6 @@ Step 1 : follow the LangGraph tutorial "Build a custom workflow"
 Step 2 : use the base to create a different custom workflow
 
 To use, install all dependancies : requirements.txt
-Add your Google Gemini API key in .env
+Fullfil the .env (all parameters are mandatory)
 Run : python -m main
 Exit with "quit", "exit", "q"