added sections and references in credentials handling in ECK

deploy-manage/deploy/cloud-on-k8s/configure-deployments.md

@@ -19,6 +19,8 @@ This section provides details around {{kib}} and {{es}} configuration when runni
 
 Additionally, the following topics apply to both {{es}} and {{kib}}, and in some cases, to other applications supported by ECK:
 
+* [**Users and roles**](/deploy-manage/users-roles/cluster-or-deployment-auth/managed-credentials-eck.md): Learn how to work with managed credentials, create custom users, and configure authentication realms.
+
 * [**Access services**](accessing-services.md): Learn how to access to the orchestrated clusters and how to adapt the Kubernetes services to your needs.
 
 * [**Customize Pods**](customize-pods.md): Learn how to adapt the `podTemplate` field to your needs.

deploy-manage/users-roles/cluster-or-deployment-auth/managed-credentials-eck.md

@@ -72,3 +72,31 @@ kubectl delete secret -l eck.k8s.elastic.co/credentials=true
 ::::{warning}
 This command regenerates auto-generated credentials of **all** {{stack}} applications in the namespace.
 ::::
+
+## Creating custom users
+
+{{eck}} provides functionality to facilitate custom user creation through various authentication realms. You can create users using the native realm, file realm, or external authentication methods.
+
+### Native realm
+
+You can create custom users in the {{es}} native realm using {{es}} user management APIs or {{kib}}.
+
+Refer to [Native user authentication](/deploy-manage/users-roles/cluster-or-deployment-auth/native.md) for more details.
+
+### File realm
+
+Custom users can also be created by providing the desired file realm content or a username and password in Kubernetes secrets, referenced in the {{es}} resource.
+
+For more information, refer to [File-based user authentication](/deploy-manage/users-roles/cluster-or-deployment-auth/file-based.md).
+
+### External authentication realms
+
+You can also configure external authentication realms such as LDAP, OpenID Connect, or SAML in your ECK deployments by providing the appropriate {{es}} or {{kib}} configuration settings and any required [certificates or configuration files](/deploy-manage/deploy/cloud-on-k8s/custom-configuration-files-plugins.md).
+
+For more information, refer to [External authentication](/deploy-manage/users-roles/cluster-or-deployment-auth/external-authentication.md).
+
+## Creating custom roles
+
+Roles can be specified using the Role management API, or the Role management UI in {{kib}}. Additionally, file-based role management can be achieved by referencing Kubernetes secrets containing the roles specification.
+
+Refer to [Managing custom roles](/deploy-manage/users-roles/cluster-or-deployment-auth/defining-roles.md#managing-custom-roles) for details and examples.