Update app.py

add the addition tool

app.py

@@ -13,8 +13,8 @@ def addition_tool(num1:int, num2:int)-> int: #it's import to specify the return
     #Keep this format for the description / args / args description but feel free to modify the tool
     """A tool that sum up 2 number 
     Args:
-        arg1: the first number
-        arg2: the second number
+        num1: the first number
+        num2: the second number
     """
     return num1 + num2