Added DTOs for Destination service

FitConnect.sln

FitConnect/FitConnect.csproj

Services/DestinationService.cs

Services/InfoService.cs

Services/Models/ApiInfoDto.cs

Services/Models/CallbackDto.cs

Services/Models/CreateCallbackDto.cs

Services/Models/CreateSubmission.cs

Services/Models/Destination/ContactInformationDto.cs

Services/Models/Destination/CreateDestinationDto.cs

Services/Models/Destination/DeMailDto.cs

Services/Models/Destination/DestinationListDto.cs

Services/Models/Destination/DestinationReplyChannelsDto.cs

Services/Models/Destination/DestinationServiceDto.cs

Services/Models/Destination/ElsterDto.cs

Services/Models/Destination/EmailDto.cs

Services/Models/Destination/FinkDto.cs

Services/Models/Destination/PatchDestinationDto.cs

Services/Models/Destination/PrivateDestinationDto.cs

Services/Models/Destination/PublicDestinationDto.cs