added missed fuel up feature.

Models/GasRecord/GasRecord.cs

@@ -15,6 +15,7 @@
         public decimal Gallons { get; set; }
         public decimal Cost { get; set; }
         public bool IsFillToFull { get; set; } = true;
+        public bool MissedFuelUp { get; set; } = false;
         public List<UploadedFiles> Files { get; set; } = new List<UploadedFiles>();
     }
 }