(DOCSP-29237): Kotlin FAQ (#50)

# Pull Request Info

[PR Reviewing
Guidelines](https://github.com/mongodb/docs-java/blob/master/REVIEWING.md)

JIRA - https://jira.mongodb.org/browse/DOCSP-29237
Staging -
https://docs-mongodbcom-staging.corp.mongodb.com/kotlin/docsworker-xlarge/DOCSP-29237/faq/

## Self-Review Checklist

- [ ] Is this free of any warnings or errors in the RST?
- [ ] Did you run a spell-check?
- [ ] Did you run a grammar-check?
- [ ] Are all the links working?

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Co-authored-by: cbullinger <[email protected]>

Author: mongodben