function: initialize_route
args: ROUTE:  A string such as '/' and '/admin'
      METHOD: A list such as ["GET"] and ["POST", "GET"]
      ID:     An integer. The number of the page for the website
      ARGS:   Parameter part of the page call function
      CODE:   Code section of the site call function section

Use this function to define a page location for the PSML built-in Flask server. The principle is to test the code based on the page first, and then use it formally when starting the server.
