Include documentation in the application

doc/mysql-configuration.markdown

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+How to use Mysql or MariaDB instead of Sqlite
+=============================================
+
+By default Kanboard use Sqlite to stores its data.
+However it's possible to use Mysql or MariaDB instead of Sqlite.
+
+Requirements
+------------
+
+- Mysql server
+- The PHP extension `pdo_mysql` installed (Debian/Ubuntu: `apt-get install php5-mysql`)
+
+Note: Kanboard is tested with **Mysql >= 5.5 and MariaDB >= 10.0**
+
+Mysql configuration
+-------------------
+
+### Create a database
+
+The first step is to create a database on your Mysql server.
+By example, you can do that with the command line mysql client:
+
+```sql
+CREATE DATABASE kanboard;
+```
+
+### Create a config file
+
+The file `config.php` should contains those values:
+
+```php
+<?php
+
+// We choose to use Mysql instead of Sqlite
+define('DB_DRIVER', 'mysql');
+
+// Mysql parameters
+define('DB_USERNAME', 'REPLACE_ME');
+define('DB_PASSWORD', 'REPLACE_ME');
+define('DB_HOSTNAME', 'REPLACE_ME');
+define('DB_NAME', 'kanboard');
+```
+
+Note: You can also rename the template file `config.default.php` to `config.php`.