Add LoginService initialisation

Helios/Program.cs

-var builder = WebApplication.CreateBuilder(args);
+using Helios.Source;
+
+var builder = WebApplication.CreateBuilder(args);
 
 // Add services to the container.
 builder.Services.AddControllersWithViews();
 
+builder.Services.AddTransient<LoginService>(provider
+    => new LoginService(builder.Configuration.GetConnectionString("default")));
+
 var app = builder.Build();
 
 // Configure the HTTP request pipeline.