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

Backend.Api/Data/Vehicle.cs

@@ -0,0 +1,9 @@
+namespace Backend.Api.Data
+{
+    public class Vehicle
+    {
+        public long Id { get; set; }
+        public long OwnerId { get; set; }
+        public string PlateNumber { get; set; } = "Undefined plate number";
+    }
+}