add ping endpoint for status service

src/Controllers/Common/PingController.cs

@@ -0,0 +1,17 @@
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace sodoff.Controllers.Common
+{
+    [ApiController]
+    public class PingController : Controller
+    {
+        [HttpPost]
+        [Produces("applcation/xml")]
+        [Route("PingWebService.asmx/GetPingPayload")]
+        public IActionResult GetPingPayload()
+        {
+            return Ok("Pong!");
+        }
+    }
+}