Initial vendor packages

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

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+# num-rational
+
+[![crate](https://img.shields.io/crates/v/num-rational.svg)](https://crates.io/crates/num-rational)
+[![documentation](https://docs.rs/num-rational/badge.svg)](https://docs.rs/num-rational)
+[![minimum rustc 1.31](https://img.shields.io/badge/rustc-1.31+-red.svg)](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
+[![build status](https://github.com/rust-num/num-rational/workflows/master/badge.svg)](https://github.com/rust-num/num-rational/actions)
+
+Generic `Rational` numbers (aka fractions) for Rust.
+
+## Usage
+
+Add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+num-rational = "0.4"
+```
+
+## Features
+
+This crate can be used without the standard library (`#![no_std]`) by disabling
+the default `std` feature.  Use this in `Cargo.toml`:
+
+```toml
+[dependencies.num-rational]
+version = "0.4"
+default-features = false
+```
+
+## Releases
+
+Release notes are available in [RELEASES.md](RELEASES.md).
+
+## Compatibility
+
+The `num-rational` crate is tested for rustc 1.31 and greater.
+
+## License
+
+Licensed under either of
+
+ * [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
+ * [MIT license](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.