SYM-3 | Initial commit

src/FactoryMethod/README.md

src/Iterator/Payment.php

src/Iterator/PaymentList.php

src/Iterator/README.md

src/Observer/Card.php

src/Observer/CardObserver.php

src/Observer/README.md

src/Registry/README.md

src/Registry/Registry.php

src/ServiceLocator/README.md

src/ServiceLocator/RegisterService.php

src/ServiceLocator/ServiceInterface.php

src/ServiceLocator/ServiceLocator.php

src/Strategy/AnnuityPayment.php

src/Strategy/DifferentialPayment.php

src/Strategy/Payment.php

src/Strategy/README.md