Adding timestamp to vanity model

Models/Vanity.cs

+using System;
 using System.ComponentModel.DataAnnotations;
 
 namespace Stratis.Guru.Models
 {
     public class Vanity
     {
+        public DateTime CreationDatetime { get; set; } = DateTime.Now;
+        
         [Required(ErrorMessage = "The prefix is required.")]
         [StringLength(4, MinimumLength = 1, ErrorMessage = "You connat overflow the size.")]
         public string Prefix { get; set; }