input: Write a function to log a custom message to a file using the logging module.
  assert log_custom_message('Test message') is None
output: import logging
  
  def log_custom_message(message):
      # Configure the logging
      logging.basicConfig(filename='custom_log.log', level=logging.INFO, 
                          format='%(asctime)s:%(levelname)s:%(message)s')
      # Log the custom message
      logging.info(message)