chore: checkpoint before Python removal

vendor/h2/README.md

@@ -0,0 +1,58 @@
+# H2
+
+A Tokio aware, HTTP/2 client & server implementation for Rust.
+
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
+[![Crates.io](https://img.shields.io/crates/v/h2.svg)](https://crates.io/crates/h2)
+[![Documentation](https://docs.rs/h2/badge.svg)][dox]
+
+More information about this crate can be found in the [crate documentation][dox].
+
+[dox]: https://docs.rs/h2
+
+## Features
+
+* Client and server HTTP/2 implementation.
+* Implements the full HTTP/2 specification.
+* Passes [h2spec](https://github.com/summerwind/h2spec).
+* Focus on performance and correctness.
+* Built on [Tokio](https://tokio.rs).
+
+## Non goals
+
+This crate is intended to only be an implementation of the HTTP/2
+specification. It does not handle:
+
+* Managing TCP connections
+* HTTP 1.0 upgrade
+* TLS
+* Any feature not described by the HTTP/2 specification.
+
+This crate is now used by [hyper](https://github.com/hyperium/hyper), which will provide all of these features.
+
+## Usage
+
+To use `h2`, first add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+h2 = "0.4"
+```
+
+Next, add this to your crate:
+
+```rust
+extern crate h2;
+
+use h2::server::Connection;
+
+fn main() {
+    // ...
+}
+```
+
+## FAQ
+
+**Is this an embedded Java SQL database engine?**
+
+[No](https://www.h2database.com).