help: Add introduction to users page.

help/introduction-to-users.md

@@ -0,0 +1,31 @@
+# Introduction to users
+
+A **user** is an individual's account within a Zulip
+[organization](/help/join-a-zulip-organization). Administrators can
+[configure](/help/restrict-account-creation) how accounts are created in their
+organization, and [how users will log
+in](/help/configure-authentication-methods).
+
+Zulip lets users and organization administrators configure the following
+details. This information is summarized in a user's [card](/help/user-cards),
+and presented in detail in their [profile](/help/view-someones-profile).
+
+- [Profile picture](/help/change-your-profile-picture)
+- [Name](/help/change-your-name)
+- [Role](/help/user-roles) in the organization
+- [Status and availability](/help/status-and-availability), and whether
+  the account has been [deactivated](/help/deactivate-or-reactivate-a-user)
+- Current [local time](/help/change-your-timezone)
+- Email address, with configurable [permissions to view it](/help/configure-email-visibility)
+- [Custom profile fields](/help/custom-profile-fields)
+
+Users can also be members of [groups](/help/user-groups), and subscribe to
+[channels](/help/introduction-to-channels).
+
+## Related articles
+
+* [User list](/help/user-list)
+* [Status and availability](/help/status-and-availability)
+* [User cards](/help/user-cards)
+* [View someone's profile](/help/view-someones-profile)
+* [Bots overview](/help/bots-overview)