added the matrix group link as a privacy preserving alternative (#1255)

Co-authored-by: Zehka <git@zehka.net>

docs/FAQ.md

@@ -354,4 +354,4 @@ Arduino Core (open source) are the core libraries for ESP8266/ESP8285 chips to m
 You can see the Arduino Core Version and the Espressif SDK Version on the Tasmota WebUI under the Information Menu entry.
 
 ## I Cannot Find An Answer Here!
-Check the [Troubleshooting](Troubleshooting) section or join [Discord](https://discord.gg/Ks2Kzd4), [Telegram](https://t.me/tasmota), [Reddit](https://www.reddit.com/r/tasmota/) or [Google Groups](https://groups.google.com/d/forum/sonoffusers) for assistance from other Tasmota users.  
+Check the [Troubleshooting](Troubleshooting) section or join [Discord](https://discord.gg/Ks2Kzd4), [Matrix](https://matrix.to/#/%23tasmota:matrix.org), [Telegram](https://t.me/tasmota), [Reddit](https://www.reddit.com/r/tasmota/) or [Google Groups](https://groups.google.com/d/forum/sonoffusers) for assistance from other Tasmota users.

docs/index.md

@@ -45,6 +45,7 @@ For feedback, questions, live troubleshooting or just general chat
 <a href="https://discord.gg/Ks2Kzd4"><img src="https://discordapp.com/api/guilds/479389167382691863/widget.png?style=banner3"></a>
 
 - [Telegram](https://t.me/tasmota)
+- [Matrix](https://matrix.to/#/%23tasmota:matrix.org)
 - [Reddit](https://www.reddit.com/r/tasmota/) 
 - [Google Groups](https://groups.google.com/d/forum/sonoffusers)