Addition of get_hypotenuse tool

I have added the first tool. It used to be a non-working dummy tool.

app.py

@@ -9,14 +9,15 @@ 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
+def get_hypotenuse(a:float, b:float)-> str: #it's import to specify the return type
     #Keep this format for the description / args / args description but feel free to modify the tool
-    """A tool that does nothing yet 
+    """A tool that gets the hypothenuse based on their edges' length  
     Args:
-        arg1: the first argument
-        arg2: the second argument
+        a: first edge
+        b: second edge
     """
-    return "What magic will you build ?"
+    hypotenuse = (a**2 + b**2)**0.5
+    return f"The hypotenuse of the triangle given the other two edges is {hypotenuse}"
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: