Add UnrealIRCd IRC daemon to Communication - IRC section (#2670)

README.md

@@ -363,6 +363,7 @@ Mailing lists servers and mass mailing software - one message to many recipients
 - [Robust IRC](https://robustirc.net/) - RobustIRC is IRC without netsplits. Distributed IRC server, based on RobustSession protocol. ([Source Code](https://github.com/robustirc/robustirc)) `BSD-3-Clause` `Go`
 - [The Lounge](https://thelounge.chat/) - Self-hosted web IRC client. ([Demo](https://demo.thelounge.chat/), [Source Code](https://github.com/thelounge/thelounge)) `MIT` `Nodejs`
 - [Tiny Tiny IRC](https://tt-rss.org/tt-irc/) - An open source AJAX-powered chat platform with support for IRC ([Source Code](https://git.tt-rss.org/fox/tt-irc)). `GPL-3.0` `PHP/Java`
+- [UnrealIRCd](https://www.unrealircd.org/) - Modular, advanced and highly configurable IRC server written in C for Linux, BSD, Windows, and macOS. ([Source Code](https://github.com/unrealircd/unrealircd)) `GPL-2.0` `C`
 - [Weechat](https://weechat.org/) - Fast, light and extensible chat client. `GPL-3.0` `C`
 - [ZNC](https://wiki.znc.in/ZNC) - Advanced IRC bouncer. ([Source Code](https://github.com/znc/znc)) `Apache-2.0` `C++`