Vendor dependencies for 0.3.0 release

vendor/metal/README.md

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+# metal-rs
+[![Actions Status](https://github.com/gfx-rs/metal-rs/workflows/ci/badge.svg)](https://github.com/gfx-rs/metal-rs/actions)
+[![Crates.io](https://img.shields.io/crates/v/metal.svg?label=metal)](https://crates.io/crates/metal)
+
+<p align="center">
+  <img width="150" height="150" src="./assets/metal.svg">
+</p>
+
+<p align="center">Unsafe Rust bindings for the Metal 3D Graphics API.</p>
+
+## Examples
+
+The [examples](/examples) directory highlights different ways of using the Metal graphics API for rendering
+and computation.
+
+Examples can be run using commands such as:
+
+```
+# Replace `window` with the name of the example that you would like to run
+cargo run --example window
+```
+
+## 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.