Add string-machine to the Open Audio Stack registry

[kmturley]

Hello!

We are curating a list of open-source audio software at Open Audio Stack. We've created an open registry and package manager for installing/upgrading audio plugins, apps, presets and projects (think npm/Homebrew, but for audio software). We'd like to include string-machine, but it requires a few small changes.

Requirements checklist: (last checked 2026-07-18)

• License specified as a LICENSE file, SPDX/REUSE annotations, or a clear statement in the README — Boost Software License 1.0
• GitHub release with downloadable binaries (zip/tar/exe/dmg/deb — source-only releases don't count), tagged with a fixed date or semantic version — the v0.1.0 asset (string-machine-0.1.0.tar.gz) looks like a source tarball rather than a compiled binary; the README's own download link points to an OpenSUSE Build Service package rather than a GitHub release
• Preview image in the README or repo — a UI screenshot, or a logo/icon if the project is headless — none found anywhere in the repo

Once everything above is checked off, string-machine can be added automatically — no further action needed from your side beyond that. If any box looks wrong (e.g. we missed an existing license or image), add a comment to this issue and we'll correct it. And if you'd rather this project not be listed at all, feel free to close this issue — we'll leave it alone.

Thanks!