В VS2017 нет файла appsettings.json

{
"Data": {
"НазваниеПроекта":{
"ConnectionString ": "Server=(localdb)\\MSSQLLocalDB;
Database=НазваниеПроекта; Trusted_Connection=True; MultipleActiveResultSets=true"
}}}

An error occurred while calling method 'BuildWebHost' on class 'Program'. Continuing without the application service provider. Error: Cannot resolve scoped service 'SportsStore.Models.ApplicationDbContext' from root provider.
Unable to create an object of type 'ApplicationDbContext'. Add an implementation of 'IDesignTimeDbContextFactory<ApplicationDbContext>' to the project, or see https://go.microsoft.com/fwlink/?linkid=851728 for additional patterns supported at design time.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
 
namespace SportsStore.Models
{
    public class ApplicationDbContext: DbContext
    {
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
            :base(options) { }  
        public DbSet<Product> Products { get; set; }
    }
}

  public static void EnsurePopulated(IServiceProvider applicationBuilder)
        {
            ApplicationDbContext context = applicationBuilder.GetRequiredService<ApplicationDbContext>();
        }
 
 
public class Startup
{
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IServiceProvider serviceProvider)
        {
            app.UseDeveloperExceptionPage();
            app.UseStatusCodePages();
            app.UseStaticFiles();
            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Product}/{action=List}/{id?}");
            });
             SeedData.EnsurePopulated(serviceProvider);
 
        }
}