Kotlin implementation for Lists

[apurvabanka]

What GitHub issue does this PR apply to?

Resolves #738

What changed and why?

Concept implementation for Lists in Kotlin.

(If editing website code) Please add screenshots

Checklist

• I claimed any associated issue(s) and they are not someone else's
• I have looked at documentation to ensure I made any revisions correctly
• I tested my changes locally to ensure they work
• For language files, I have validated the edited files are valid JSON and data shows up correctly
• For website code edits, I have added or edited any appropriate unit tests for my changes

Any additional comments or things to be aware of while reviewing?

[geekygirlsarah]

I don't see any problems. I'll merge it in!

Thanks for another good contribution!