public async Task <IActionResult> SolveQuiz(Guid quizId)
{
SampleQuiz sample = await _context.GetSampleQuiz(quizId);
SolvingQuiz quiz = SolvingQuiz.CreateFromSample(sample);
await _context.AddQuizesToUser(quiz, sample, _userManager.GetUserId(User));
return(RedirectToAction("SolveQuestions", new { quizId = quiz.Id, sampleId = sample.Id }));
}