Add citing instructions for ExecuTorch

[digantdesai]

Added citation guidelines for ExecuTorch in README. Spot checked with basic latex rendering using \cite{executorch2026}

[pytorch-bot]

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[Copilot]

Pull request overview

Adds citation guidance to the README so researchers can cite ExecuTorch.

Changes:

• Adds a “Citing ExecuTorch” section.
• Provides a BibTeX entry for the ExecuTorch arXiv preprint.

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[digantdesai]

@mergennachin, thinking more, we can also wait for MLSys 2026 proceedings to go live and cite that entry. WDYT?