Demonstrate basic JSON file reading capability

[joshmhanson]

Description

This is a basic demonstration of how we can use the Jackson library to load a JSON array of interview questions into a list of instances of InterviewQuestion.

Testing

I've included a main method in InterviewQuestionLoader, along with a toString method inside InterviewQuestion, to demonstrate that it's correctly loading the JSON from the mock interview questions file.

Checklist

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• I've linked this pull request to an issue.
• I've assigned myself as the Assignee and labelled the PR correctly.