Add a Readme, mostly for the changelog

readme.txt

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+=== Maintenance Mode ===
+Contributors: wpcomvip, automattic, benoitchantre, emrikol, philipjohn
+Tags: maintenance-mode maintenance
+Requires at least: 4.6
+Tested up to: 4.7
+Stable tag: 0.2.0
+License: GPLv2 or later
+License URI: https://www.gnu.org/licenses/gpl-2.0.html
+
+Shut down your site for a little while and do some maintenance on it!
+
+== Description ==
+
+Usage:
+ - Add a template to your theme's root folder called `template-maintenance-mode.php`.
+ - This should be a simple HTML page that should include the message you want to show your visitors.
+ - Note: the template should include `wp_head()` and `wp_footer()` calls.
+ - Add the VIP_MAINTENANCE_MODE constant to your theme and set to `true`.
+
+== Installation ==
+
+1. Install the plugin.
+1. Set the `VIP_MAINTENANCE_MODE` constant to true.
+1. Activate.
+
+== Changelog ==
+
+= 0.2.0 =
+* Return a 503 header while maintenance mode is active (props benoitchantre)
+* Add an admin bar notice when Maintenance Mode is on (props benoitchantre)
+
+= 0.1.0 =
+* Initial plugin