Orphan model

- Added Orphan model and specs
- Added Address model and specs
This is a typo. I meant PR #17 . After that is merged, these validations will done as mentioned in https://github.com/NikitaAvvakumov/osra/commit/19dbbd87126ce628f2ebd310cbe7cfd6bbc35dd3#commitcomment-7538464