[Concept Entry] Rust Collections #3376

[moha230]

Description

• added concept entry rust Collections
• added a folder collections
• added a file collections.md
• Closes issue #3376

Type of Change

• Adding concept entry

Checklist

• [X] All writings are my own.
• [X] My entry follows the Codecademy Docs style guide.
• [ ] My changes generate no new warnings.
• [X] I have performed a self-review of my own writing and code.
• [X] I have checked my entry and corrected any misspellings.
• [X] I have made corresponding changes to the documentation if needed.
• [X] I have confirmed my changes are not being pushed from my forked main branch.
• [X] I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• [X] Under "Development" on the right, I have linked any issues that are relevant to this PR

[moha230]

its done @dakshdeepHERE

[dakshdeepHERE]

LGTM @moha230 🚀

[moha230]

Hello @dakshdeepHERE the [84a7631] push is causing some error please advice . Thank you

[dakshdeepHERE]

@moha230 don't worry about those errors. We will fix it in the end.

[moha230]

Hello @avdhoottt its done

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