added verbose name and verbose name plural to the working hours model

Author: Abhimanue-rajesh

appointment/models.py

@@ -907,4 +907,6 @@ def is_owner(self, user_id):
         return self.staff_member.user.id == user_id
 
     class Meta:
+        verbose_name = "Working Hour"
+        verbose_name_plural = "Working Hours"
         unique_together = ['staff_member', 'day_of_week']