Add styx-testhelpers README

Author: fasterthanlime

crates/styx-testhelpers/README.md

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+# styx-testhelpers
+
+[![crates.io](https://img.shields.io/crates/v/styx-testhelpers.svg)](https://crates.io/crates/styx-testhelpers)
+[![documentation](https://docs.rs/styx-testhelpers/badge.svg)](https://docs.rs/styx-testhelpers)
+[![MIT/Apache-2.0 licensed](https://img.shields.io/crates/l/styx-testhelpers.svg)](./LICENSE)
+
+Various shared helpers for styx tests.
+
+## Sponsors
+
+Thanks to all individual sponsors:
+
+<p> <a href="https://github.com/sponsors/fasterthanlime">
+<picture>
+<source media="(prefers-color-scheme: dark)" srcset="https://github.com/bearcove/styx/raw/main/static/sponsors-v3/github-dark.svg">
+<img src="https://github.com/bearcove/styx/raw/main/static/sponsors-v3/github-light.svg" height="40" alt="GitHub Sponsors">
+</picture>
+</a> <a href="https://patreon.com/fasterthanlime">
+    <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="https://github.com/bearcove/styx/raw/main/static/sponsors-v3/patreon-dark.svg">
+    <img src="https://github.com/bearcove/styx/raw/main/static/sponsors-v3/patreon-light.svg" height="40" alt="Patreon">
+    </picture>
+</a> </p>
+
+...along with corporate sponsors:
+
+<p> <a href="https://aws.amazon.com">
+<picture>
+<source media="(prefers-color-scheme: dark)" srcset="https://github.com/bearcove/styx/raw/main/static/sponsors-v3/aws-dark.svg">
+<img src="https://github.com/bearcove/styx/raw/main/static/sponsors-v3/aws-light.svg" height="40" alt="AWS">
+</picture>
+</a> <a href="https://zed.dev">
+<picture>
+<source media="(prefers-color-scheme: dark)" srcset="https://github.com/bearcove/styx/raw/main/static/sponsors-v3/zed-dark.svg">
+<img src="https://github.com/bearcove/styx/raw/main/static/sponsors-v3/zed-light.svg" height="40" alt="Zed">
+</picture>
+</a> <a href="https://depot.dev?utm_source=facet">
+<picture>
+<source media="(prefers-color-scheme: dark)" srcset="https://github.com/bearcove/styx/raw/main/static/sponsors-v3/depot-dark.svg">
+<img src="https://github.com/bearcove/styx/raw/main/static/sponsors-v3/depot-light.svg" height="40" alt="Depot">
+</picture>
+</a> </p>
+
+...without whom this work could not exist.
+
+## License
+
+Licensed under either of:
+
+- Apache License, Version 2.0 ([LICENSE-APACHE](https://github.com/bearcove/styx/blob/main/LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>)
+- MIT license ([LICENSE-MIT](https://github.com/bearcove/styx/blob/main/LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
+
+at your option.

crates/styx-testhelpers/README.md.in

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+Various shared helpers for styx tests.