Update README.md

[coreyjadams]

PhysicsNeMo Pull Request

Description

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.
• The CHANGELOG.md is up to date with these changes.
• An issue is linked to this pull request.
• If I am implementing a new model or modifying any existing model, I have followed the Models Implementation Coding Standards.

Dependencies

Review Process

All PRs are reviewed by the PhysicsNeMo team before merging.

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[greptile-apps]

Greptile Summary

This PR updates the README.md notification banner to announce the v2.0 update. The change replaces a previous note about the NVIDIA Modulus rename with a new message informing users about the v2.0 upgrade and linking to the migration guide.

Changes:

• Updated the top banner message from "NVIDIA Modulus has been renamed to NVIDIA PhysicsNeMo" to announce v2.0 update
• Added link to v2.0-MIGRATION-GUIDE.md for users to learn about breaking changes
• The migration guide exists and provides information about core reorganization, new packages, and how to update code

Assessment:
This is a documentation-only change with no code modifications. The update appropriately informs users about the v2.0 release and provides them with resources to migrate their code. The migration guide link is correct and the file exists in the repository.

Important Files Changed

Filename	Overview
README.md	Updated notification banner to announce v2.0 update with link to migration guide. Clean documentation change with no code impact.

[coreyjadams]

/blossom-ci