Adds gfg soln "find-duplicates-in-an-array"

[arunimaChintu]

Related Issue

Closes #2000

Description

Adds gfg soln "find-duplicates-in-an-array"

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[deepsource-io]

Here's the code health analysis summary for commits 5056e6d..e2615f1. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗

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[github-actions]

Great job, @arunimaChintu! 🎉 Thank you for submitting your pull request to CodeHarborHub. We appreciate your contribution and enthusiasm! Our team will review it soon. If you have any questions or need further assistance, feel free to reach out. Thanks for contributing!

[ajay-dhangar]

update your code based on suggestions

[ajay-dhangar]

Replace

Note: Try and perform all operations within the provided array. The extra (non-constant) space needs to be used only for the array to be returned.

to

:::note
 Try and perform all operations within the provided array. The extra (non-constant) space needs to be used only for the array to be returned.
:::

[arunimaChintu]

@ajay-dhangar updated the code as suggested. Please merge it.

[ajay-dhangar]

Done