Vendor things

third-party/vendor/png/README.md

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+# PNG Decoder/Encoder
+[![Build Status](https://github.com/image-rs/image-png/workflows/Rust%20CI/badge.svg)](https://github.com/image-rs/image-png/actions)
+[![Documentation](https://docs.rs/png/badge.svg)](https://docs.rs/png)
+[![Crates.io](https://img.shields.io/crates/v/png.svg)](https://crates.io/crates/png)
+![Lines of Code](https://tokei.rs/b1/github/image-rs/image-png)
+[![License](https://img.shields.io/crates/l/png.svg)](https://github.com/image-rs/image-png)
+[![fuzzit](https://app.fuzzit.dev/badge?org_id=image-rs)](https://app.fuzzit.dev/orgs/image-rs/dashboard)
+
+PNG decoder/encoder in pure Rust.
+
+It contains all features required to handle the entirety of [the PngSuite by
+Willem van Schack][PngSuite].
+
+[PngSuite]: http://www.schaik.com/pngsuite2011/pngsuite.html
+
+## pngcheck
+
+The `pngcheck` utility is a small demonstration binary that checks and prints
+metadata on every `.png` image provided via parameter. You can run it (for
+example on the test directories) with
+
+```bash
+cargo run --release --example pngcheck ./tests/pngsuite/*
+```
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or https://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or https://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.