Added an PHP CS fixer config file and applied it to files.

We now use the same the same style as the symfony project, and it allows us to simply fix the style by executing php_cs_fixer fix in the project root.

src/Exceptions/EntityNotSupportedException.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony)
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
  * Copyright (C) 2019 Jan Böhmer (https://github.com/jbtronics)
  *
@@ -17,7 +17,6 @@
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
- *
  */
 
 namespace App\Exceptions;