Add readme.

imports/wasi_http/README.md

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+# WASI-HTTP
+This module implements the [wasi-http](https://github.com/WebAssembly/wasi-http) specification.
+The specification is in active development/flux as is the [`wit-bindgen`](https://github.com/bytecodealliance/wit-bindgen) tool which is used to generate client libraries.
+
+You should expect a degree of instability in these interfaces for the foreseeable future.
+
+## Example guest code
+There are existing examples of working guest code in the following languages
+* [Golang](https://github.com/dev-wasm/dev-wasm-go/tree/main/http)
+* [C](https://github.com/dev-wasm/dev-wasm-c/tree/main/http)
+* [AssemblyScript](https://github.com/dev-wasm/dev-wasm-ts/tree/main/http)
+* [Dotnet](https://github.com/dev-wasm/dev-wasm-ts/tree/main/http)
+* [Rust](https://github.com/bytecodealliance/wasmtime/blob/main/crates/test-programs/wasi-http-tests/src/bin/outbound_request.rs)