adding health endpoint for k8s

Selector.Web/Controller/HealthController.cs

@@ -0,0 +1,24 @@
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Selector.Web.Controller
+{
+
+    [ApiController]
+    [Route("health")]
+    public class HealthController : Microsoft.AspNetCore.Mvc.Controller
+    {
+        public HealthController()
+        {
+
+        }
+
+        [HttpGet]
+        [AllowAnonymous]
+        public Task<ActionResult> Health()
+        {
+            return Task.FromResult<ActionResult>(Ok());
+        }
+    }
+}