rust-jpl 0.0.1

Rust library for NASA JPL DE441 ephemeris: precise planetary positions for astronomy, astrophysics, and astrology applications
Documentation
## Summary

What does this PR change?

## Motivation

Why is this change needed? Link issues if applicable.

## JPL Context

Which NASA JPL service, protocol, or dataset does this affect?

## Type of Change

- [ ] Bug fix
- [ ] New feature
- [ ] Breaking change
- [ ] Performance improvement
- [ ] Refactor
- [ ] Documentation

## Implementation Notes

Key decisions, trade-offs, or limitations.

## Testing

- [ ] Unit tests
- [ ] Integration tests
- [ ] Manual testing

Describe how this was tested.

## API Impact

- [ ] No public API changes
- [ ] Additive API changes
- [ ] Breaking API changes

## Checklist

- [ ] `cargo fmt`
- [ ] `cargo clippy`
- [ ] `cargo test`
- [ ] Public APIs documented
- [ ] Unsafe code justified or avoided