Add Dendrite to Custom Communication Systems (#3339)

README.md

@@ -317,6 +317,7 @@ _See also: [Comparison of CalDAV and CardDAV implementations - Wikipedia](https:
 - [Chitchatter](https://chitchatter.im/) - A peer-to-peer chat app that is serverless, decentralized, and ephemeral. ([Source Code](https://github.com/jeremyckahn/chitchatter)) `GPL-2.0` `Nodejs`
 - [Darkwire.io](https://github.com/darkwire/darkwire.io) - End-to-end encrypted instant web chat. `MIT` `Nodejs`
 - [Databag](https://github.com/balzack/databag) - Federated messaging client for the web, iOS, and Android, supporting text, photos and video. ([Demo](https://databag.coredb.org/#/create)) `Apache-2.0` `Docker`
+- [Dendrite](https://matrix.org/docs/projects/server/dendrite) - Second-generation Matrix homeserver written in Go. It intends to provide an efficient, reliable and scalable alternative to Synapse. ([Source Code](https://github.com/matrix-org/dendrite)) `Apache-2.0` `Go`
 - [Element](https://element.io) - Fully-featured Matrix client for Web, iOS & Android. ([Source Code](https://github.com/vector-im/element-web)) `Apache-2.0` `Nodejs`
 - [Enigma Reloaded](https://github.com/enigma-reloaded/enigma-reloaded) - DIY Message and file encryption for any platform. `GPL-3.0` `Javascript`
 - [Freenet](https://freenetproject.org/index.html) - Anonymously share files, browse and publish _freesites_ (web sites accessible only through Freenet) and chat on forums. ([Source Code](https://github.com/freenet/fred)) `GPL-2.0` `Java`