Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

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+# [qoi](https://crates.io/crates/qoi)
+
+[![Build](https://github.com/aldanor/qoi-rust/workflows/CI/badge.svg)](https://github.com/aldanor/qoi-rust/actions?query=branch%3Amaster)
+[![Latest Version](https://img.shields.io/crates/v/qoi.svg)](https://crates.io/crates/qoi)
+[![Documentation](https://img.shields.io/docsrs/qoi)](https://docs.rs/qoi)
+[![Apache 2.0](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+[![MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
+[![unsafe forbidden](https://img.shields.io/badge/unsafe-forbidden-success.svg)](https://github.com/rust-secure-code/safety-dance)
+
+Fast encoder/decoder for [QOI image format](https://qoiformat.org/), implemented in pure and safe Rust.
+
+- One of the [fastest](#benchmarks) QOI encoders/decoders out there.
+- Compliant with the [latest](https://qoiformat.org/qoi-specification.pdf) QOI format specification.
+- Zero unsafe code.
+- Supports decoding from / encoding to `std::io` streams directly.
+- `no_std` support.
+- Roundtrip-tested vs the reference C implementation; fuzz-tested.
+
+### Examples
+
+```rust
+use qoi::{encode_to_vec, decode_to_vec};
+
+let encoded = encode_to_vec(&pixels, width, height)?;
+let (header, decoded) = decode_to_vec(&encoded)?;
+
+assert_eq!(header.width, width);
+assert_eq!(header.height, height);
+assert_eq!(decoded, pixels);
+```
+
+### Benchmarks
+
+```
+             decode:Mp/s  encode:Mp/s  decode:MB/s  encode:MB/s
+qoi.h              282.9        225.3        978.3        778.9
+qoi-rust           427.4        290.0       1477.7       1002.9
+```
+
+- Reference C implementation:
+  [phoboslab/qoi@00e34217](https://github.com/phoboslab/qoi/commit/00e34217).
+- Benchmark timings were collected on an Apple M1 laptop.
+- 2846 images from the suite provided upstream
+  ([tarball](https://phoboslab.org/files/qoibench/qoi_benchmark_suite.tar)):
+  all pngs except two with broken checksums.
+- 1.32 GPixels in total with 4.46 GB of raw pixel data.
+
+Benchmarks have also been run for all of the other Rust implementations
+of QOI for comparison purposes and, at the time of writing this document,
+this library proved to be the fastest one by a noticeable margin.
+
+### Rust version
+
+The minimum required Rust version for the latest crate version is 1.61.0.
+
+### `no_std`
+
+This crate supports `no_std` mode. By default, std is enabled via the `std`
+feature. You can deactivate the `default-features` to target core instead.
+In that case anything related to `std::io`, `std::error::Error` and heap
+allocations is disabled. There is an additional `alloc` feature that can
+be activated to bring back the support for heap allocations.
+
+### License
+
+This project is dual-licensed under MIT and Apache 2.0.