add sql table creation statement

Author: Craig Ballinger

README.md

@@ -6,9 +6,24 @@ Install the library using composer
 ```
 composer install syntactical/session
 ```
-Using a PDO MySQL session store
-```php
 
+##Using a PDO MySQL session store
+
+Create the table:
+```sql
+CREATE TABLE `sessions` (
+  `id` varchar(40) NOT NULL DEFAULT '0',
+  `ip` int(10) NOT NULL DEFAULT '0',
+  `user_agent` varchar(50) NOT NULL,
+  `last_activity` int(10) unsigned NOT NULL DEFAULT '0',
+  `data` text NOT NULL,
+  PRIMARY KEY (`id`),
+  KEY `last_activity` (`last_activity`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+```
+
+Bootstrap the library:
+```php
 $db = new PDO('mysql:host=your.db.host;dbname=db','username','password');
 $table = 'sessions';
 $storage = new MySQLStorage($db, $table);