Add short repo overview to README

README.md

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+[![CI Status]][workflow] [![MSRV]][repo] [![Latest Version]][crates.io] [![Rust Doc Main]][docs]
+
+[CI Status]: https://img.shields.io/github/actions/workflow/status/juntyr/numcodecs-rs/ci.yml?branch=main
+[workflow]: https://github.com/juntyr/numcodecs-rs/actions/workflows/ci.yml?query=branch%3Amain
+
+[MSRV]: https://img.shields.io/badge/MSRV-1.76.0-blue
+[repo]: https://github.com/juntyr/numcodecs-rs
+
+[Latest Version]: https://img.shields.io/crates/v/numcodecs
+[crates.io]: https://crates.io/search?q=numcodecs
+
+[Rust Doc Main]: https://img.shields.io/badge/docs-main-blue
+[docs]: https://juntyr.github.io/numcodecs-rs
 # numcodecs-rs
 
+This repository provides a compression codec API in Rust inspired by the [`numcodecs`] Python API.
+
+The repository is structured as follows:
+
+- [`crates`](crates): Fundamental compression API crates
+  - [`numcodecs`](crates/numcodecs): Rusty compression codec API
+  - [`numcodecs-python`](crates/numcodecs-python): Rust bindings to the [`numcodecs`] Python API, which allows Python codecs to be used in Rust and Rust codecs to be used in Python
+  - [`numcodecs-wasm-guest`](crates/numcodecs-wasm-guest): Export a Rust codec as a WebAssembly [component] when compiling to WebAssembly
+- [`codecs`](codecs): Codec implementation crates, some new, some adapting existing [`numcodecs`] codecs with a more composable API
+
+[`numcodecs`]: https://numcodecs.readthedocs.io/en/stable/
+[component]: https://component-model.bytecodealliance.org/design/components.html
+
 ## License
 
 Licensed under the Mozilla Public License, Version 2.0 ([LICENSE](LICENSE) or https://www.mozilla.org/en-US/MPL/2.0/).