Vendor things

third-party/vendor/spirv/README.md

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+spirv-headers of the rspirv project
+===================================
+
+[![Crate][img-crate-headers]][crate-headers]
+[![Documentation][img-doc-headers]][doc-headers]
+
+The headers crate for the rspirv project which provides Rust definitions of
+SPIR-V structs, enums, and constants.
+
+Usage
+-----
+
+This project uses associated constants, which became available in the stable channel
+since [1.20][rust-1.20]. So to compile with a compiler from the stable channel,
+please make sure that the version is >= 1.20.
+
+First add to your `Cargo.toml`:
+
+```toml
+[dependencies]
+spirv = "0.2.0+1.5.4"
+```
+
+Version
+-------
+
+Note that the major and minor version of this create is tracking the SPIR-V spec,
+while the patch number is used for bugfixes for the crate itself. So version
+`1.4.2` is tracking SPIR-V 1.4 but not necessarily revision 2. Major client APIs
+like Vulkan/OpenCL pin to a specific major and minor version, regardless of the
+revision.
+
+Examples
+--------
+
+Please see the [documentation][doc-headers] and project's
+[README][project-readme] for examples.
+
+[img-crate-headers]: https://img.shields.io/crates/v/spirv.svg
+[img-doc-headers]: https://docs.rs/spirv/badge.svg
+[crate-headers]: https://crates.io/crates/spirv
+[doc-headers]: https://docs.rs/spirv
+[project-readme]: https://github.com/gfx-rs/rspirv/blob/master/README.md
+[rust-1.20]: https://blog.rust-lang.org/2017/08/31/Rust-1.20.html