New option to only allow registered users to speak WIP (#233):

* Prosody mod_muc_peertubelivechat_roles module
* Fix ConverseJS to disable the message field when room is unmoderated
  and user is visitor
* Mute/voice anonymous users when changing room configuration.
* Display a specific message to muted anonymous users.
* Default value for mute_anonymous in channel options.
* Feature documentation

support/documentation/content/en/documentation/user/streamers/channel.md

@@ -1,7 +1,7 @@
 ---
 title: "Channel configuration"
 description: "Peertube channel chatrooms configuration"
-weight: 30
+weight: 20
 chapter: false
 ---
 
@@ -20,6 +20,7 @@ By clicking on a channel, you will then be able to setup some options for your c
 
 Here you can configure:
 
+* [{{% livechat_label livechat_configuration_channel_mute_anonymous_label %}}](/peertube-plugin-livechat/documentation/user/streamers/moderation) default value
 * [The slow mode](/peertube-plugin-livechat/documentation/user/streamers/slow_mode)
 * [The chat bot](/peertube-plugin-livechat/documentation/user/streamers/bot)
 * [Custom emojis](/peertube-plugin-livechat/documentation/user/streamers/emojis)

support/documentation/content/en/documentation/user/streamers/moderation.md

@@ -1,7 +1,7 @@
 ---
 title: "Moderation"
 description: "Plugin peertube-plugin-livechat advanced moderation features"
-weight: 60
+weight: 30
 chapter: false
 ---
 
@@ -39,6 +39,30 @@ Clicking this button will give them owner access on the room.
 You can use [ConverseJS moderation commands](https://conversejs.org/docs/html/features.html#moderating-chatrooms) to moderate the room.
 When you open the chat room in full screen, there will also be a menu with dedicated commands on the top right.
 
+## {{% livechat_label livechat_configuration_channel_mute_anonymous_label %}}
+
+{{% notice info %}}
+This feature comes with the livechat plugin version 10.2.0.
+{{% /notice %}}
+
+You can prevent anonymous users to send messages. In such case, only registered users will be able to talk in the chat.
+
+To enable or disable this feature, use the [chat dropdown menu](/peertube-plugin-livechat/documentation/user/viewers), open the "configure" menu.
+In the form, you will find a "{{% livechat_label livechat_configuration_channel_mute_anonymous_label %}}" checkbox.
+
+![Room configuration / Mute anonymous users](/peertube-plugin-livechat/images/configure_mute_anonymous.png?classes=shadow,border&height=400px)
+
+Anonymous users won't have the message field, and will see following prompt: "{{% livechat_label muted_anonymous_message %}}"
+
+![Room configuration / Muted anonymous users](/peertube-plugin-livechat/images/anonymous_muted.png?classes=shadow,border&height=400px)
+
+When this feature is enabled, anonymous users will be assigned the "visitor" role.
+You can change their role to "participant" if you want to allow some of them to talk.
+
+If you change the room configuration, all anonymous users will be muted or unmuted.
+
+You can choose to enable or disable this feature for new chatrooms on the [channel configuration page](/peertube-plugin-livechat/documentation/user/streamers/channel).
+
 ## Roles and affiliations
 
 There are several roles that can be assignated to users in chat rooms: owner, moderators, member, ...