copy the readme of spirv-tools

Author: Firestar99

README.md

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+<div align="center">
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+# `🛠 spirv-tools`
+
+This crate is an unofficial wrapper for [SPIR-V Tools], its primary use case is for the [rust-gpu] project.
+
+[![Crates.io](https://img.shields.io/crates/v/spirv-tools.svg)](https://crates.io/crates/spirv-tools)
+[![Docs](https://docs.rs/spirv-tools/badge.svg)](https://docs.rs/spirv-tools)
+[![Build status](https://github.com/rust-gpu/spirv-tools-rs/workflows/CI/badge.svg)](https://github.com/rust-gpu/spirv-tools-rs/actions)
+
+</div>
+
+## Status
+
+This is a very rough wrapper around the assembler, validator, and (most of the) optimizer tools available from [SPIR-V Tools], which is enough for the current needs of the [rust-gpu] project. See that project's code for more thorough usage examples.
+
+## Contributing
+
+[![Contributor Covenant](https://img.shields.io/badge/contributor%20covenant-v1.4-ff69b4.svg)](../CODE_OF_CONDUCT.md)
+
+We welcome community contributions to this project.
+
+## License
+
+Licensed under either of
+
+- Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
+
+[SPIR-V Tools]: https://github.com/KhronosGroup/SPIRV-Tools
+[rust-gpu]: https://github.com/rust-gpu/rust-gpu