help: Add dedicated page about guest users.

help/guest-users.md

@@ -0,0 +1,27 @@
+# Guest users
+
+You can add users who should have restricted access to your organization as
+**guests**. For example, this may be a good choice for contractors or customers
+invited to a company's Zulip chat.
+
+Guest users can:
+
+- View and send messages in streams they have been added to, including viewing
+  message history in the same way as other stream subscribers.
+
+Guest users cannot:
+
+- See private or public streams, unless they have been specifically added to the stream.
+- Create new streams.
+- Add or manage bots.
+- Invite users to join the organization.
+
+Zulip Cloud plans have [special discounted
+pricing](/help/zulip-cloud-billing#temporary-users-and-guests) for guest users.
+
+## Related articles
+
+* [Roles and permissions](/help/roles-and-permissions)
+* [Invite new users](/help/invite-new-users)
+* [Change a user's role](/help/change-a-users-role)
+* [Zulip Cloud billing](/help/zulip-cloud-billing)

help/include/sidebar_index.md

@@ -182,6 +182,7 @@
 * [Roles and permissions](/help/roles-and-permissions)
 * [Invite new users](/help/invite-new-users)
 * [Restrict account creation](/help/restrict-account-creation)
+* [Guest users](/help/guest-users)
 * [Manage a user](/help/manage-a-user)
 * [Deactivate or reactivate a user](/help/deactivate-or-reactivate-a-user)
 * [Custom profile fields](/help/custom-profile-fields)