A simple WCF service and how to configure its .config file?

Question

IIS

Dear colleagues, good day! There is a simple WCF service, below I give the code of its files:
File IService1.cs

using System;
using System.ServiceModel;
namespace EssentialWCF
{
  [ServiceContract]
  public interface IService1
  {
    [OperationContract]
    double GetPrice(string ticker);
  }
  public class Service1 : IService1
  {
    public double GetPrice(string ticker)
    {
        return Int32.Parse(ticker) + 94.85;
    }
   }
 }

File Service1.svc.cs

using System;
using System.ServiceModel;
namespace EssentialWCF
{
public class Service
{
    public static void Main()
    {
        ServiceHost serviceHost = new ServiceHost(
            typeof(Service1),
            new Uri("http://localhost/EssentialWCF"));
        serviceHost.AddServiceEndpoint(
            typeof(IService1),
            new BasicHttpBinding(), "");

        serviceHost.Open();
        Console.WriteLine("Для завершения нажмите <ENTER>.\n\n");
        Console.ReadLine();
        serviceHost.Close();
    }
  }
 }

The lab assistant said to change the service like this, the C# implementation code was made in the .config file, please help.............