Add Iridium to readme (#56)

Author: avojak

readme.md

@@ -50,6 +50,7 @@ IRC (Internet Relay Chat) is an open source protocol that can be used for multi-
 - [Revolution IRC](https://github.com/MCMrARM/revolution-irc) - Feature-full, actively maintained Android IRC client. ([source](https://github.com/MCMrARM/revolution-irc)) `Android`
 - [AdiIRC](https://adiirc.com) - Never has a client offered such granular settings for every aspect of the IRC experience. ([features](https://dev.adiirc.com/projects/adiirc/wiki/Features), [screenshots](https://dev.adiirc.com/projects/adiirc/wiki/Screenshots)) `Windows` `WINE`
 - [IRC for Android™](https://www.countercultured.net/android/) Android/Chrome OS client for power users, with ZNC built-ins, notification logic, reliable DCC, keybinds for hardware keyboards, etc. `Android` `ChromeOS`
+- [Iridium](https://appcenter.elementary.io/com.github.avojak.iridium/) - Friendly IRC client built in Vala and GTK, designed for elementary OS. ([source](https://github.com/avojak/iridium)) `Linux`
 
 *More? Clients that include bouncers are found [below](#bouncers).*