public void AddNewUser(RegisterUserViewModel userData)
{
var user = userData.ToEntity();
var passwordSalt = _securityManager.GenerateNewSalt();
var passwordHash = _securityManager.ComputeHash(passwordSalt, userData.Password);
user.PasswordSalt = new BsonBinaryData(passwordSalt);
user.PasswordHash = new BsonBinaryData(passwordHash);
Users.Insert(user);
}