Add new TURN Readme and reference it from DEPLOY.md

DEPLOY.md

@@ -241,3 +241,17 @@ $ curl https://your.server.name:8448/_matrix/client/versions
 ```
 
 If you want to set up an appservice, take a look at the [Appservice Guide](APPSERVICES.md).
+
+# What's next?
+
+## Audio/Video calls
+
+For Audio/Video call functionality see the [TURN Guide](TURN.md).
+As of 2022, Clients known to support a/v calls are
+
+* Element/Android
+* SchildiChat
+
+Clients known to not support a/v calls are
+
+* FluffyChat

TURN.md

@@ -0,0 +1,25 @@
+# Setting up TURN/STURN
+
+## General instructions
+
+* It is assumed you have a [Coturn server](https://github.com/coturn/coturn) up and running. See [Synapse reference implementation](https://github.com/matrix-org/synapse/blob/develop/docs/turn-howto.md).
+
+## Edit/Add a few settings to your existing conduit.toml
+
+```
+# Refer to your Coturn settings. 
+# `server.name` has to match the REALM setting of your Coturn as well as `transport`.
+turn_uris = ["turn:server.name?transport=udp", "turn:server.name?transport=tcp"]
+
+# static-auth-secret of your turnserver
+turn_secret = "ADD SECRET HERE"
+
+# If you have your TURN server configured to use a username and password
+# you can provide these information too. In this case comment out `turn_secret above`!
+#turn_username = ""
+#turn_password = ""
+```
+
+## Apply settings
+
+Restart Conduit.