Added Test echo posting2

Controllers/TestPosting.cs

@@ -8,10 +8,10 @@ namespace NeDvachAPI.Controllers
     public class TestPostingController : ControllerBase
     {
         [HttpPost]
-        public string Area(int altitude , int height)
+        public int Area(int altitude , int height)
         {
             //DBchat.SendPost(ReceivedPost);
-            return $"Первое значение {altitude} и второе значение {height}";
+            return altitude+height;
         }
     }
 }