public IActionResult Post()
{
var uploadService = new UploadService();
List <Transaction> transactions = uploadService.GetTransactions(Request.Form.Files);
_context.Add(transactions.ElementAt(transactions.Count - 1));
_context.Add(transactions.ElementAt(transactions.Count - 2));
_context.Add(transactions.ElementAt(transactions.Count - 3));
_context.Add(transactions.ElementAt(transactions.Count - 4));
_context.Add(transactions.ElementAt(transactions.Count - 5));
_context.SaveChanges();
return(Ok(transactions));
}