Add lfm-physics to Science section

[gpartin]

lfm-physics — Lattice Field Medium physics simulation library with GPU acceleration.

• PyPI: https://pypi.org/project/lfm-physics/
• License: MIT
• Tests: 233 passing (CI via GitHub Actions)
• Python: 3.10+

Two coupled wave equations on a 3D cubic lattice derive gravity, electromagnetism, strong force, and weak force from first principles. GPU-accelerated (CuPy/CUDA) with automatic CPU fallback. Includes leapfrog integration, 7-point and 19-point isotropic Laplacian stencils, FFT Poisson solver, complete particle mass table, and 41+ derived physics constants.

[Copilot]

Pull request overview

Adds lfm-physics to the repository’s Science section to include a GPU-accelerated physics simulation library among other scientific computing resources.

Changes:

• Added a new bullet entry for lfm-physics under ## Science in README.md.

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[JinyangWang27]

@gpartin Thanks for your submission. However, this project does not meet our acceptance criteria:

Repository age: The repository was created 1 day ago. We require a minimum of 3 months (or 6 months for Hidden Gem submissions) to ensure project stability.

GitHub stars: 0 stars (minimum 100 required, or strong justification for Hidden Gem).

Please see our CONTRIBUTING.md for full requirements. You're welcome to resubmit once the project has matured and gained community traction.