convert roman numerals example with PSR-4 composer autoload

PSR-4 Autoloader implementation based on example from PHP-FIG

folder structure

.
├── bin                  # phpspec path
├── src                  # source files
├── phpspec              # phpspec tests 
├── composer.json        # Composer file
├── composer.lock        
├── index.php            # Index file that we call source files
├── phpspec.yml          # phpspec configuration 
├── .gitignore
└── README.me

installation

git clone https://github.com/onurkayaio/phpspec.git
cd phpspec
composer install

run tests

call bin/phpspec run in folder.