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<PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="1.1.3" />

using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
services.AddMvc(); //configureServices
app.UseMvc();//configure


app.UseMvc(routes=>routes.MapRoute("default","{controller}/{action}",new {controller="Home",action="Default" }));

or

app.UseMvc(routes=>routes.MapRoute("default","{controller=Home}/{action=Default}"));

or

[Route("/[controller]"),Route("/")]
    public class HomeController : Controller
    {
        // GET: /<controller>/
        [Route("[action]"),Route("")]
        public IActionResult Default()
        {
            return Content("Hello from a controller!");
        }
    }