darkmatter 0.0.1

Dark matter simulation engine — gravitational fields, particle dynamics, halo stability, and cosmological constants
Documentation
# Contributing to DarkMatter

Thank you for your interest in contributing!

## Getting Started

```bash
git clone https://github.com/celestial4498-prog/DarkMatter.git
cd DarkMatter
cargo build
cargo test
```

## Before Submitting

- [ ] `cargo fmt` — code is formatted
- [ ] `cargo clippy` — no warnings
- [ ] `cargo test` — all tests pass
- [ ] New public items have doc comments
- [ ] New modules are re-exported in their parent `mod.rs`

## Guidelines

- Keep functions focused and well-named
- Use SI units unless documented otherwise
- Add integration tests for new physics functions
- Add examples for major new features
- Do not introduce `unsafe` without justification

## Pull Requests

- One feature or fix per PR
- Describe what the PR does and why
- Reference any related issues

## Questions?

Open an issue on [GitHub](https://github.com/celestial4498-prog/DarkMatter/issues).