Update README.md

Author: nikarh

README.md

@@ -4,7 +4,8 @@
 [![GitHub Actions Build Status](https://img.shields.io/github/actions/workflow/status/vita-rust/docker/build.yml)](https://github.com/vita-rust/docker/actions/workflows/build.yml)
 [![Main Commits RSS Feed](https://img.shields.io/badge/rss-commits-ffa500?logo=rss)](https://github.com/vita-rust/docker/commits/main.atom)
 
-A Docker image built from `vitasdk/vitasdk` with added Rust nightly toolchain, `cc` and `ld` for building `std`, and `cargo-make`.
+An Alpine-based Docker image that contains [VitaSDK], Rust nightly toolchain, `cc` and `ld` for building `std`, [cargo-vita] and several additional cargo tools useful in CI ([cargo-binstall], [cargo-make], [cargo-hack], [cargo-udeps], [cargo-machete], [cargo-deny], [cargo-release]).
+
 This image is built and pushed to `ghcr` automatically weekly and on pushes to main.
 
 Feel free to use this image to build `vpk` with GitHub actions for your Rust projects, or to build your projects locally.
@@ -19,3 +20,13 @@ Except where noted (below and/or in individual files), all code in this reposito
 
 * MIT License ([LICENSE-MIT](LICENSE-MIT) or [http://opensource.org/licenses/MIT](http://opensource.org/licenses/MIT))
 * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or [http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0))
+
+[VitaSDK]: https://github.com/vitasdk
+[cargo-vita]: https://github.com/vita-rust/cargo-vita
+[cargo-binstall]: https://github.com/cargo-bins/cargo-binstall
+[cargo-make]: https://github.com/sagiegurari/cargo-make
+[cargo-hack]: https://github.com/taiki-e/cargo-hack
+[cargo-udeps]: https://github.com/est31/cargo-udeps
+[cargo-machete]: https://github.com/bnjbvr/cargo-machete
+[cargo-deny]: https://github.com/EmbarkStudios/cargo-deny
+[cargo-release]: https://github.com/crate-ci/cargo-release