public User Get(string Username)
{
var existingUser = _context.Users.FirstOrDefault(u => u.Username == Username);
if (existingUser != null)
{
return(existingUser.ToShared());
}
var newUser = new Data.User()
{
Username = Username
};
_context.Add(newUser);
_context.SaveChanges();
return(newUser.ToShared());
}