https://doc.rust-lang.org/cargo/reference/manifest.html#the-badges-section
crates.io previously displayed badges next to a crate on its website, but that functionality has been removed. Packages should place badges in its README file which will be displayed on crates.io
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actively-developed
: New features are being added and bugs are being fixed.![maintenance-status](https://img.shields.io/badge/maintenance-actively--developed-brightgreen.svg)
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passively-maintained
: There are no plans for new features, but the maintainer intends to respond to issues that get filed.![maintenance-status](https://img.shields.io/badge/maintenance-passively--maintained-yellowgreen.svg)
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as-is
: The crate is feature complete, the maintainer does not intend to continue working on it or providing support, but it works for the purposes it was designed for.![maintenance-status](https://img.shields.io/badge/maintenance-as--is-yellow.svg)
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experimental
: The author wants to share it with the community but is not intending to meet anyone's particular use case.![maintenance-status](https://img.shields.io/badge/maintenance-experimental-blue.svg)
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looking-for-maintainer
: The current maintainer would like to transfer the crate to someone else.![maintenance-status](https://img.shields.io/badge/maintenance-looking--for--maintainer-orange.svg)
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deprecated
: The maintainer does not recommend using this crate (the description of the crate can describe why, there could be a better solution available or there could be problems with the crate that the author does not want to fix).![maintenance-status](https://img.shields.io/badge/maintenance-deprecated-red.svg)