Implement UseCases

[HenryQuan]

The UseCase is mostly for connecting multiple services into one. It will define like a use case for example searching player & clan, getting the entire player data, build the clan info, player ship filter. Currently, I will be focusing on the player/clan search part mostly for the existing React Native app to move over some shared logics.

[HenryQuan]

The service layer should be almost fine, the next step will be the UseCase. First, I can start with the search use case and experiment with clan use case and lastly the player use case including also other things like ship filter.