initial

dotnet/Program.cs

@@ -0,0 +1,9 @@
+var builder = WebApplication.CreateBuilder(args);
+var app = builder.Build();
+
+var port = Environment.GetEnvironmentVariable("PORT") ?? "5000";
+var url = $"http://0.0.0.0:{port}";
+
+app.MapGet("", () => "Hello World!");
+
+app.Run(url);