Added all php file headers

* All headers follow FOS format, defined in https://github.com/FriendsOfSymfony/friendsofsymfony.github.com/issues/14#issuecomment-1236022
Merge pull request #80 from mmoreram/feature/php-file-headers

Added all php file headers
Added all php file headers

* All headers follow FOS format, defined in https://github.com/FriendsOfSymfony/friendsofsymfony.github.com/issues/14#issuecomment-1236022