Create mechanism for the test question with options

[aistomin]

Now we have only questions where user have to input the answer. We need the answers with options. For the first implementation let's cover the following scenario:

1. Display the question with a) b) c) d) ... answer options.
2. User have to input "a" or "b" or "c" or "d" ...
3. The software validates if the user selected the right option.
4. Display the result to the user.

[aistomin]

Done in scope of #25 and #26