docs update

docs/configuration/auth.md

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+
+### Configuring Auth service to use database
+You can store your users inside mysql database (default is json file).
+
+First, create a table ```users``` with this sql:
+```
+CREATE TABLE `users` (
+    `id` int(10) NOT NULL AUTO_INCREMENT,
+    `username` varchar(255) NOT NULL,
+    `name` varchar(255) NOT NULL,
+    `role` varchar(20) NOT NULL,
+    `permissions` varchar(200) NOT NULL,
+    `homedir` varchar(2000) NOT NULL,
+    `password` varchar(255) NOT NULL,
+    PRIMARY KEY (`id`),
+    KEY `username` (`username`)
+) CHARSET=utf8 COLLATE=utf8_bin;
+```
+Then, import default users with this query:
+
+```
+INSERT INTO `users` (`username`, `name`, `role`, `permissions`, `homedir`, `password`)
+VALUES
+('guest', 'Guest', 'guest', '', '/', ''),
+('admin', 'Admin', 'admin', 'read|write|upload|download|batchdownload|zip', '/', '$2y$10$Nu35w4pteLfc7BDCIkDPkecjw8wsH8Y2GMfIewUbXLT7zzW6WOxwq');
+```
+
+Ath the end, open ```configuration.php``` and update Auth handler under section ```services``` to something like this:
+
+```
+        'Filegator\Services\Auth\AuthInterface' => [
+            'handler' => '\Filegator\Services\Auth\Adapters\Database',
+            'config' => [
+                'driver' => 'mysqli',
+                'host' => 'localhost',
+                'username' => 'root',
+                'password' => 'password',
+                'database' => 'filegator',
+            ],
+        ],
+```
+