Initial vendor packages

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

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+# Serde   [![Build Status]][actions] [![Latest Version]][crates.io] [![serde: rustc 1.31+]][Rust 1.31] [![serde_derive: rustc 1.56+]][Rust 1.56]
+
+[Build Status]: https://img.shields.io/github/actions/workflow/status/serde-rs/serde/ci.yml?branch=master
+[actions]: https://github.com/serde-rs/serde/actions?query=branch%3Amaster
+[Latest Version]: https://img.shields.io/crates/v/serde.svg
+[crates.io]: https://crates.io/crates/serde
+[serde: rustc 1.31+]: https://img.shields.io/badge/serde-rustc_1.31+-lightgray.svg
+[serde_derive: rustc 1.56+]: https://img.shields.io/badge/serde_derive-rustc_1.56+-lightgray.svg
+[Rust 1.31]: https://blog.rust-lang.org/2018/12/06/Rust-1.31-and-rust-2018.html
+[Rust 1.56]: https://blog.rust-lang.org/2021/10/21/Rust-1.56.0.html
+
+**Serde is a framework for *ser*ializing and *de*serializing Rust data structures efficiently and generically.**
+
+---
+
+You may be looking for:
+
+- [An overview of Serde](https://serde.rs/)
+- [Data formats supported by Serde](https://serde.rs/#data-formats)
+- [Setting up `#[derive(Serialize, Deserialize)]`](https://serde.rs/derive.html)
+- [Examples](https://serde.rs/examples.html)
+- [API documentation](https://docs.rs/serde)
+- [Release notes](https://github.com/serde-rs/serde/releases)
+
+## Serde in action
+
+<details>
+<summary>
+Click to show Cargo.toml.
+<a href="https://play.rust-lang.org/?edition=2018&gist=72755f28f99afc95e01d63174b28c1f5" target="_blank">Run this code in the playground.</a>
+</summary>
+
+```toml
+[dependencies]
+
+# The core APIs, including the Serialize and Deserialize traits. Always
+# required when using Serde. The "derive" feature is only required when
+# using #[derive(Serialize, Deserialize)] to make Serde work with structs
+# and enums defined in your crate.
+serde = { version = "1.0", features = ["derive"] }
+
+# Each data format lives in its own crate; the sample code below uses JSON
+# but you may be using a different one.
+serde_json = "1.0"
+```
+
+</details>
+<p></p>
+
+```rust
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug)]
+struct Point {
+    x: i32,
+    y: i32,
+}
+
+fn main() {
+    let point = Point { x: 1, y: 2 };
+
+    // Convert the Point to a JSON string.
+    let serialized = serde_json::to_string(&point).unwrap();
+
+    // Prints serialized = {"x":1,"y":2}
+    println!("serialized = {}", serialized);
+
+    // Convert the JSON string back to a Point.
+    let deserialized: Point = serde_json::from_str(&serialized).unwrap();
+
+    // Prints deserialized = Point { x: 1, y: 2 }
+    println!("deserialized = {:?}", deserialized);
+}
+```
+
+## Getting help
+
+Serde is one of the most widely used Rust libraries so any place that Rustaceans
+congregate will be able to help you out. For chat, consider trying the
+[#rust-questions] or [#rust-beginners] channels of the unofficial community
+Discord (invite: <https://discord.gg/rust-lang-community>), the [#rust-usage] or
+[#beginners] channels of the official Rust Project Discord (invite:
+<https://discord.gg/rust-lang>), or the [#general][zulip] stream in Zulip. For
+asynchronous, consider the [\[rust\] tag on StackOverflow][stackoverflow], the
+[/r/rust] subreddit which has a pinned weekly easy questions post, or the Rust
+[Discourse forum][discourse]. It's acceptable to file a support issue in this
+repo but they tend not to get as many eyes as any of the above and may get
+closed without a response after some time.
+
+[#rust-questions]: https://discord.com/channels/273534239310479360/274215136414400513
+[#rust-beginners]: https://discord.com/channels/273534239310479360/273541522815713281
+[#rust-usage]: https://discord.com/channels/442252698964721669/443150878111694848
+[#beginners]: https://discord.com/channels/442252698964721669/448238009733742612
+[zulip]: https://rust-lang.zulipchat.com/#narrow/stream/122651-general
+[stackoverflow]: https://stackoverflow.com/questions/tagged/rust
+[/r/rust]: https://www.reddit.com/r/rust
+[discourse]: https://users.rust-lang.org
+
+<br>
+
+#### License
+
+<sup>
+Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
+2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
+</sup>
+
+<br>
+
+<sub>
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in Serde by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.
+</sub>