Update app.py

app.py

@@ -12,6 +12,13 @@ from Gradio_UI import GradioUI
 def count(txt:str, c:int)-> int:
     """A tool that counts the number of occurences of c in txt. 
     E.g. if txt="abcea" and c="a", it returns 2.
+
+    Args:
+        txt: the containing string
+        c: the char to be counted.
+
+    Returns: number of c in txt
+    
     """
     n = 0
     for i in txt: