Add ShardTensor citation to README.

[coreyjadams]

PhysicsNeMo Pull Request

Description

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• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
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• The CHANGELOG.md is up to date with these changes.
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[greptile-apps]

Greptile Summary

This PR adds a BibTeX citation entry for the ShardTensor paper to README.md, directing users who use the domain parallelism components to cite the corresponding arXiv preprint.

• Adds a prose introduction and a @misc BibTeX block for ShardTensor: Domain Parallelism for Scientific Machine Learning (arXiv 2605.11111, year 2026) between the existing citation guidance and the Communication section.
• The BibTeX entry is syntactically correct: authors are and-separated, all standard fields are present, and the URL matches the eprint ID.

Important Files Changed

Filename	Overview
README.md	Adds a BibTeX citation block for the ShardTensor paper (arXiv 2605.11111) with introductory prose, placed between the existing citation guidance and the Communication section.

_{Reviews (1): Last reviewed commit: "Add ShardTensor citation to README." | Re-trigger Greptile}

[coreyjadams]

@ram-cherukuri @megnvidia Tagging you both for vis. New citation for ShardTensor is on arxiv, so this puts it on the readme too. When approved I can merge it in.

[coreyjadams]

/blossom-ci