Add orchestration enrollment samples

AspireOrchestratorEnrollment/PreEnrollmentApp/OnlineShop.Web/Program.cs

@@ -0,0 +1,35 @@
+using OnlineShop.Web;
+using OnlineShop.Web.Components;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddRazorComponents()
+    .AddInteractiveServerComponents();
+
+builder.Services.AddOutputCache();
+
+builder.Services.AddHttpClient<ProductsApiClient>(client =>
+    {
+        client.BaseAddress = new(builder.Configuration["ApiUrl"]!);
+    });
+
+var app = builder.Build();
+
+if (!app.Environment.IsDevelopment())
+{
+    app.UseExceptionHandler("/Error", createScopeForErrors: true);
+    app.UseHsts();
+}
+
+app.UseHttpsRedirection();
+
+app.UseAntiforgery();
+
+app.UseOutputCache();
+
+app.MapStaticAssets();
+
+app.MapRazorComponents<App>()
+    .AddInteractiveServerRenderMode();
+
+app.Run();