Add plugin, update README

README.md

@@ -1,2 +1,5 @@
-# biscotti
-Biscotti bakes your WordPress logged in user cookie for an extended period of time.
+# Biscotti
+
+Biscotti is a plugin that changes the expiration of the logged in user cookie in WordPress to one year. Because some people hate entering their passwords.
+
+To install this plugin, drop `biscotti.php` into your site's `wp-content/mu-plugins` directory.

biscotti.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * Biscotti
+ *
+ * Biscotti is a plugin that changes the expiration of the logged in user
+ * cookie in WordPress to one year. Because some people hate entering
+ * their passwords.
+ *
+ * @link              https://github.com/boogah/biscotti
+ * @package           Biscotti
+ * @author            Jason Cosper <boogah@gmail.com>
+ * @license           GPL-3.0
+ *
+ * @wordpress-plugin
+ * Plugin Name:       Biscotti
+ * Plugin URI:        https://github.com/boogah/biscotti
+ * Description:       Bakes your cookie for an extended period of time.
+ * Version:           1.0.0
+ * Author:            Jason Cosper
+ * Author URI:        https://jasoncosper.com/
+ * License:           GPL-3.0
+ * License URI:       http://www.gnu.org/licenses/gpl-3.0.txt
+ */
+
+// If this file is called directly, abort.
+if ( ! defined( 'WPINC' ) ) {
+	die;
+}
+
+/**
+ * Set the login cookie's expiration date to one year.
+ *
+ * @since 1.0.0
+ * @param int $expirein Seconds.
+ */
+function biscotti_wp_cookie_logout( $expirein ) {
+	return 31556926;
+}
+add_filter( 'auth_cookie_expiration', 'biscotti_wp_cookie_logout' );