Add Romania vehicle registration plates

Description

Add Romanian vehicle Registration Plate Generator https://en.wikipedia.org/wiki/Vehicle_registration_plates_of_Romania

LINQPad Code Example

 var fakeAuto = new Faker<AutoObject>("ro")
         .RuleFor(a => a.Plate, (f, _) => f.Vehicle..RoRegistrationPlate())

What alternatives have you considered?

No

Could you help with a pull-request?

Yes