Controllers\HomeController.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;

namespace yourComplaint.Controllers
{
    public class HomeController : Controller
    {
        public string Index()
        {
            return "Hello World! :)";
        }

    }
}