This is a great PHP add-on, for WordPress, which tells site users that the site has been temporarily disabled.
Obviously, you can edit that message to whatever you desire. The add-on comes with features, such as social icons, and email address functionality. The possibilities of what you can do with this add-on are endless!
Simply upload this file to the root directory of your WordPress installation and add a simple redirect to ‘yoursite.com/wp-disabled.php’.
This add-on is very well documented, and additional support is available.
This file automatically uses all the same styling as your standard ‘wp-login.php’ page.
Changelog (oldest – newest)
Version 1.0 - 9th April 2013 - Original Release Version
Version 1.1 - 22nd April 2013 - Cleaned-up code in main PHP file
Version 1.2 - 26th September 2013 - Better WordPress 3.6 compatibility