Add badges to Chrono-TZ readme

README.md

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 # Chrono-TZ
 
+[![Chrono-TZ GitHub Actions][gh-image]][gh-checks]
+[![Chrono-TZ on crates.io][cratesio-image]][cratesio]
+[![Chrono-TZ on docs.rs][docsrs-image]][docsrs]
+[![Chat][discord-image]][discord]
+
+[gh-image]: https://github.com/chronotope/chrono-tz/actions/workflows/rust.yml/badge.svg
+[gh-checks]: https://github.com/chronotope/chrono-tz/actions/workflows/rust.yml
+[cratesio-image]: https://img.shields.io/crates/v/chrono-tz.svg
+[cratesio]: https://crates.io/crates/chrono-tz
+[docsrs-image]: https://docs.rs/chrono-tz/badge.svg
+[docsrs]: https://docs.rs/chrono-tz
+[discord-image]: https://img.shields.io/discord/976380008299917365?logo=discord
+[discord]: https://discord.gg/sXpav4PS7M
+
 `Chrono-TZ` is a library that provides implementors of the [`TimeZone`] trait for [chrono]. The
 impls are generated by a build script using the [`IANA database`][iana] and [`parse-zoneinfo`].