unixorn/tumult.plugin.zsh

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# Description

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## Type of changes

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- [ ] Adds/updates a helper script
- [ ] Adds/updates a link to an external resource like a blog post or video
- [ ] Text change (fix typos, update formatting)
- [ ] Test changes

## Copyright Assignment

- [ ] This repository is covered by the [Apache License](https://github.com/unixorn/tumult.plugin.zsh/blob/master/LICENSE), and I agree to contribute this PR under the terms of that license.

## Checklist

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- [ ] All new and existing tests pass.
- [ ] I have signed off my commits. You can use `git commit --amend --no-edit --signoff` to amend an existing commit, and you can find more details about signing off commits on the DCO GitHub action page [here](https://probot.github.io/apps/dco/)
- [ ] Any scripts added/updated use `#!/usr/bin/env interpreter` instead of direct paths. `#!/bin/sh` is an allowed exception.
- [ ] Scripts added/updated are marked executable
- [ ] I have added/updated a credit line to README.md for any scripts added or updated in this PR.
- [ ] If there was no author credit in a script added in this PR, I have added one.
- [ ] I have confirmed that the link(s) in this PR are valid.
- [ ] I have read the [CONTRIBUTING](https://github.com/unixorn/tumult.plugin.zsh/blob/main/Contributing.md) page.