add matrix to list of secure communication/messengers

README.md

@@ -434,6 +434,7 @@ Only main chapters:
 ##### :black_small_square: Messengers (end-to-end encryption)
 
 <p>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://matrix.org//"><b>Matrix</b></a> - an open network for secure, decentralized, real-time communication.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.signal.org/"><b>Signal</b></a> - is an encrypted communications app.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://wire.com/en/"><b>Wire</b></a> - secure messaging, file sharing, voice calls and video conferences. All protected with end-to-end encryption.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/prof7bit/TorChat"><b>TorChat</b></a> - decentralized anonymous instant messenger on top of Tor Hidden Services.<br>