pull_request_template.md

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- Closes #

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Changes proposed in this pull request:

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## Checklist
_This section is for the PR reviewer_

- [ ] PR has an interpretable title with a prefix (`[ENH]`, `[FIX]`, `[REF]`, `[TST]`, `[CI]`, `[MNT]`, `[INF]`, `[MODEL]`, `[DOC]`) _(see our [Contributing Guidelines](https://neurobagel.org/contributing/CONTRIBUTING#pull-request-guidelines) for more info)_
- [ ] PR links to GitHub issue with mention `Closes #XXXX`
- [ ] Tests pass
- [ ] Checks pass

For new features:
- [ ] Tests have been added

For bug fixes:
- [ ] There is at least one test that would fail under the original bug conditions.