Added first app template

backend/login-counter/app/HostExtensions.cs

@@ -0,0 +1,30 @@
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using app.Data;
+
+namespace app
+{
+    public static class HostExtensions
+    {
+        public static IHost SeedData(this IHost host)
+        {
+            using (var scope = host.Services.CreateScope())
+            {
+                var services = scope.ServiceProvider;
+                var context = services.GetService<DatabaseContext>();
+
+                // now we have the DbContext. Run migrations
+                context.Database.Migrate();
+                
+                #if DEBUG
+                // now that the database is up to date. Let's seed
+                new DataSeeder(context).SeedData();
+                #endif
+            }
+
+            return host;
+        }
+    }
+}