Added Flight Service

FlightMicroservice/.dockerignore

FlightMicroservice/Controllers/FlightController.cs

FlightMicroservice/Controllers/SeatController.cs

FlightMicroservice/Dockerfile

FlightMicroservice/FlightMicroservice.csproj

FlightMicroservice/FlightMicroservice.csproj.user

FlightMicroservice/FlightMicroservice.http

FlightMicroservice/FlightMicroservice.sln

FlightMicroservice/Models/ApplicationDbContext.cs

FlightMicroservice/Models/Flight.cs

FlightMicroservice/Models/FlightCreationModel.cs

FlightMicroservice/Models/Seat.cs

FlightMicroservice/Program.cs

FlightMicroservice/Properties/launchSettings.json

FlightMicroservice/Services/FlightService.cs

FlightMicroservice/Services/IFlightService.cs

FlightMicroservice/Services/ISeatService.cs

FlightMicroservice/Services/SeatService.cs

FlightMicroservice/appsettings.Development.json

FlightMicroservice/appsettings.json