Add orchestration enrollment samples

AspireOrchestratorEnrollment/PreEnrollmentApp/OnlineShop.AppHost/AppHost.cs

@@ -0,0 +1,18 @@
+var builder = DistributedApplication.CreateBuilder(args);
+
+var sql = builder.AddSqlServer("sql").WithLifetime(ContainerLifetime.Persistent);
+var sqldb = sql.AddDatabase("sqldb");
+
+var apiService = builder.AddProject<Projects.OnlineShop_ApiService>("apiservice")
+    .WithHttpHealthCheck("/health")
+    .WaitFor(sqldb)
+    .WithReference(sqldb);
+
+builder
+    .AddProject<Projects.OnlineShop_Web>("webfrontend")
+    .WithExternalHttpEndpoints()
+    .WithHttpHealthCheck("/health")
+    .WithReference(apiService)
+    .WaitFor(apiService);
+
+builder.Build().Run();