Update README

README.md

@@ -19,6 +19,8 @@ Using this playbook, you can get the following services configured on your serve
 
 - (optional, default) a [Synapse](https://github.com/matrix-org/synapse) homeserver - storing your data and managing your presence in the [Matrix](http://matrix.org/) network
 
+- (optional) a [Dendrite](https://github.com/matrix-org/dendrite) homeserver - storing your data and managing your presence in the [Matrix](http://matrix.org/) network. Dendrite is a second-generation Matrix homeserver written in Go, an alternative to Synapse.
+
 - (optional) [Amazon S3](https://aws.amazon.com/s3/) storage for Synapse's content repository (`media_store`) files using [Goofys](https://github.com/kahing/goofys)
 
 - (optional, default) [PostgreSQL](https://www.postgresql.org/) database for Synapse. [Using an external PostgreSQL server](docs/configuring-playbook-external-postgres.md) is also possible.

docs/container-images.md

@@ -30,6 +30,8 @@ These services are enabled and used by default, but you can turn them off, if yo
 
 These services are not part of our default installation, but can be enabled by [configuring the playbook](configuring-playbook.md) (either before the initial installation or any time later):
 
+- [matrixdotorg/dendrite-monolith](https://hub.docker.com/r/matrixdotorg/dendrite-monolith/) - the official [Dendrite](https://github.com/matrix-org/dendrite) Matrix homeserver (optional)
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 - [ewoutp/goofys](https://hub.docker.com/r/ewoutp/goofys/) - the [Goofys](https://github.com/kahing/goofys) Amazon [S3](https://aws.amazon.com/s3/) file-system-mounting program (optional)
 
 - [etherpad/etherpad](https://hub.docker.com/r/etherpad/etherpad/) - the [Etherpad](https://etherpad.org) realtime collaborative text editor that can be used in a Jitsi audio/video call or integrated as a widget into Matrix chat rooms via the Dimension integration manager (optional)