implemented basic crud logic; NB: CONNECTION STRING IN PROGRAM.CS IS EMPTY

Backend.Api/Data/User.cs

@@ -0,0 +1,9 @@
+namespace Backend.Api.Data
+{
+    public class User
+    {
+        public long Id { get; set; }
+        public string Name { get; set; } = "Undefined name";
+        public string Surname { get; set; } = "Undefined surname";
+    }
+}