Add `imap-codec`

It's stable, actively maintained, and has more than 2000 downloads on crates.io.

README.md

@@ -1204,6 +1204,7 @@ See also [About Rust’s Machine Learning Community](https://medium.com/@autumn_
 
 [[email](https://crates.io/keywords/email), [imap](https://crates.io/keywords/imap), [smtp](https://crates.io/keywords/smtp)]
 
+* [duesee/imap-codec](https://github.com/duesee/imap-codec) [[imap-codec](https://crates.io/crates/imap-codec)] — Rock-solid and complete codec for IMAP [![Build & Test](https://github.com/duesee/imap-codec/actions/workflows/build_and_test.yml/badge.svg)](https://github.com/duesee/imap-codec/actions/workflows/build_and_test.yml)
 * [gsquire/sendgrid-rs](https://github.com/gsquire/sendgrid-rs) — unofficial Rust library for SendGrid API
 * [jdrouet/catapulte](https://github.com/jdrouet/catapulte) - A microservice to send emails using [MRML](https://github.com/jdrouet/mrml) templates.
 * [jdrouet/jolimail](https://github.com/jdrouet/jolimail) - A web application to build [MRML](https://github.com/jdrouet/mrml) templates.