Enabled controllers.

Proculite.GpioRest/Controllers/BasicController.cs

@@ -0,0 +1,13 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace Proculite.GpioRest.Controllers
+{
+    public class BasicController : Controller
+    {
+        [HttpGet("/ping")]
+        public IActionResult Ping()
+        {
+            return Ok("Pong");
+        }
+    }
+}

Proculite.GpioRest/Program.cs

@@ -4,9 +4,11 @@ var builder = WebApplication.CreateBuilder(args);
 // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
+builder.Services.AddControllers();
 
 var app = builder.Build();
 
+app.MapControllers();
 app.UseSwagger();
 app.UseSwaggerUI();