A tutorial about Ion Auth and authentication in CI3

CREATE TABLE IF NOT EXISTS `ci_sessions` (
`id` varchar(128) NOT NULL,
`ip_address` varchar(45) NOT NULL,
`timestamp` int(10) unsigned NOT NULL DEFAULT '0',
`data` blob NOT NULL,
PRIMARY KEY (`id`),
KEY `ci_sessions_timestamp` (`timestamp`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;