docs: add citation metadata

[timcogan]

Summary by CodeRabbit

• Documentation
  • Added citation metadata for the project to support proper referencing.
  • Updated the README with a new citation section and guidance on how to cite the project.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 558461e3-30b3-4adb-85e2-0b805c48f53a

📥 Commits

Reviewing files that changed from the base of the PR and between a34f0fd and 539f869.

📒 Files selected for processing (2)

• CITATION.cff
• README.md

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📝 Walkthrough

Walkthrough

This PR adds citation metadata for the Perspecta DICOM Viewer project. CITATION.cff is populated with software and preferred-citation fields referencing a 2026 engrXiv preprint, and README.md gains a new "Citation" section referencing this file.

Changes

Citation metadata addition

Layer / File(s)	Summary
Citation file and README update CITATION.cff, README.md	CITATION.cff is populated with citation message, authorship, repository/project URLs, license, and preferred-citation details for the engrXiv preprint; README.md adds a "Citation" section instructing users to reference CITATION.cff.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Related Issues: None found in the provided context.

Related PRs: None found in the provided context.

Suggested labels: documentation

Suggested reviewers: timcogan

🐰 A citation file, crisp and new,
Points to a preprint, tried and true,
README now shows the way to cite,
Perspecta's roots, now in plain sight!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	No pull request description was provided, so the required summary, testing, screenshots, and checklist sections are missing.	Add the template sections: Summary, Testing, Screenshots if needed, and Checklist, with a brief explanation of what changed and how it was verified.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the docs-only addition of citation metadata.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/add-citation-metadata

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