added description tool

app.py

@@ -10,6 +10,7 @@ from Gradio_UI import GradioUI
 # Below is an example of a tool that does nothing. Amaze us with your creativity !
 @tool
 def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return type
+    """Tool for information"""
     return f"Hello, {arg1}. You are {arg2}."
 
 @tool