Pure Go HDF5 Reader Library - Complementary Alternative for Cross-Platform Deployments

Hi HDF5 community! 👋

I wanted to share a new pure Go HDF5 library that might be useful for certain use cases: **[scigolib/hdf5](https://github.com/scigolib/hdf5)**

## Background

Your `gonum/hdf5` library has been an excellent reference and inspiration! While it provides comprehensive HDF5 functionality through CGo bindings, we've built a **pure Go read-only implementation** to address specific
deployment scenarios.

## Why Pure Go?

We created this library to solve challenges with:
- **Cross-compilation** - No C dependencies = easier builds for multiple platforms
- **Containerization** - Smaller Docker images without HDF5 C libraries
- **Cloud deployments** - Simpler deployment on AWS Lambda, Cloud Functions, etc.
- **Windows/macOS** - No need to install HDF5 system libraries

## Current Status (v0.9.0-beta)

**Supported:**
- ✅ Superblock versions 0, 2, 3
- ✅ Object headers (v2)
- ✅ Groups (traditional + modern formats)
- ✅ Datasets (compact, contiguous, chunked with GZIP)
- ✅ Datatypes (integers, floats, strings, compounds)
- ✅ File traversal and navigation
- ✅ Cross-platform CI/CD (Linux, macOS, Windows)

**Not Yet:**
- ❌ Writing (read-only by design for safety)
- ❌ Advanced compression (SZIP, LZF, etc.)
- ❌ Some complex datatypes (arrays, enums, references)

## Use Cases

**Use `gonum/hdf5` when you need:**
- Full read/write capabilities
- Advanced HDF5 features
- Maximum compatibility

**Use `scigolib/hdf5` when you need:**
- Pure Go (no CGo)
- Easy cross-compilation
- Lightweight deployments
- Read-only access is sufficient

## Feedback Welcome!

We're actively testing against real-world HDF5 files. If anyone has:
- Edge cases or problematic files to test
- Suggestions for priority features
- Interest in collaboration

Please feel free to open issues or discussions!

## Links

- **Repository:** https://github.com/scigolib/hdf5
- **Module:** `github.com/scigolib/hdf5`
- **License:** MIT

Thank you to the `gonum/hdf5` maintainers for the excellent reference implementation! 🙏

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*Note: This is not meant to replace `gonum/hdf5` but to complement it for specific deployment scenarios. Both libraries serve different needs.*

The issue contains no repository files, tests, or entry points to inspect. It announces the external scigolib/hdf5 project and requests feedback rather than defining a change or completion criteria, so there is no actionable starting point or clear definition of done.

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