public Startup(IWebHostEnvironment env)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", reloadOnChange: true, optional: true)
.AddEnvironmentVariables();
Configuration = builder.Build();
Log.Logger = LoggingExtensions.AddLogging(Configuration);
}