Implement multiple choice questions

[jjmark15]

Requirements

• [ ] store list of answer options
• [ ] make sure that the construction of options doesn't become complicated due to constructor requirements such as those that might be needed for calculated answers

Describe the solution you'd like

A clear and concise description of what you want to happen.

Example

What colour do you get if you mix red and blue?

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.

Suggestions

could have the following trait to be implemented on an answer type:

pub trait IncorrectAnswerOptions: Hash + Sized {
    fn incorrect_options(&self, quantity: usize) -> HashSet<Self>;
}