// So ServiceProvider = Default IServiceProvider
// Extensions are in Microsoft.Framework.DependencyInjection.Interfaces.ServiceProviderExtensions
public void Main(string[] args)
{
IConfiguration configuration = new ConfigurationBuilder(Environment.CurrentDirectory).AddJsonFile("config.json").Build();
var azureConfig = ConfigurationBinder.Bind<AzureConfig>(configuration.GetConfigurationSection("Azure"));
IServiceCollection services = new ServiceCollection();
services.AddTransient((service) => azureConfig);
services.AddDocumentDbFun();
var provider = services.BuildServiceProvider();
var docDbRepo = provider.GetService<IDocumentDbRepository>();
//Task.WaitAll(docDbRepo.CreateDocDb());
var documents = docDbRepo.ReadDocuments();
}