Move English documentation to folder en_US

doc/en_US/mysql-configuration.markdown

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+MySQL/MariaDB Configuration
+===========================
+
+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
+
+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`.
+
+### Importing SQL dump (alternative method)
+
+For the first time, Kanboard will run one by one each database migration and this process can take some time according to your configuration.
+
+To avoid any potential timeout you can initialize the database directly by importing the SQL schema:
+
+```bash
+mysql -u root -p my_database < app/Schema/Sql/mysql.sql
+```
+
+The file `app/Schema/Sql/mysql.sql` is a SQL dump that represents the last version of the database.
+
+SSL configuration
+-----------------
+
+These parameters have to be defined to enable the MySQL SSL connection:
+
+```php
+// MySQL SSL key
+define('DB_SSL_KEY', '/path/to/client-key.pem');
+
+// MySQL SSL certificate
+define('DB_SSL_CERT', '/path/to/client-cert.pem');
+
+// MySQL SSL CA
+define('DB_SSL_CA', '/path/to/ca-cert.pem');
+```