some more work on api

Pilz.Net/Api/ApiResponse{T}.cs

@@ -0,0 +1,17 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Net;
+
+namespace Pilz.Net.Api;
+
+public record class ApiResponse<T>(
+    HttpStatusCode StatusCode,
+    T? Message)
+    where T : ApiMessage
+{
+    [MemberNotNull(nameof(Message))]
+    public void EnsureOk()
+    {
+        if (StatusCode != HttpStatusCode.OK || Message is null)
+            throw new Exception("Api return is not ok!");
+    }
+}