Configure server for invoice validation service

[IvanSolovjev]

Server requirements: https://lumen.laravel.com/docs/5.5#server-requirements . Application sources you can find here - https://github.com/test-point/testpoint-bill/tree/master/src-php . We already have existing deployment process. Please ask @kshychko about details

[messiahUA]

https://bill.testpoint.io/