Update app.py

app.py

@@ -54,6 +54,10 @@ def pdok_location_info(postal_code: Optional[str] = None, house_number: Optional
     house_number: House number.
     street_name: Street name.
     city: City name.
+
+    A postalcode and housenumber or a streetname, housenumber and city are required.
+
+    Ask the user for additional input if you miss an element to fullfill the requirements of this tool, don't fill in these elements on your own.
     
     Returns:
         A PDOKLocationInfo object containing the location information, or None if no results are found.