add documentation for LDAP security provider [CN-995]

docs/modules/ROOT/examples/management-center-ldap.yaml

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+apiVersion: hazelcast.com/v1alpha1
+kind: ManagementCenter
+metadata:
+  name: managementcenter
+spec:
+  repository: "hazelcast/management-center"
+  licenseKeySecretName: hazelcast-license-key
+  securityProvider:
+    ldap:
+      credentialsSecretName: ldap-credentianls
+      groupDn: ou=users,dc=example,dc=org
+      groupSearchFilter: member={0}
+      nestedGroupSearch: false
+      url: ldap://ldap-server-url:1389
+      userDn: ou=users,dc=example,dc=org
+      userGroups:
+      - users
+      metricsOnlyGroups:
+      - metrics
+      adminGroups:
+      - admins
+      readonlyUserGroups:
+      - readers
+      userSearchFilter: cn={0}

docs/modules/ROOT/pages/management-center-ldap.adoc

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+= LDAP Security Provider
+:description: You can use your existing LDAP server for authentication/authorization on the Management Center.
+
+See xref:management-center:deploy-manage:ldap.adoc[Management Center Documentation] for more detailed information.
+
+== Setting Up the LDAP Security Provider
+
+To set up LDAP, you need to configure the `securityProvider.ldap` section in the Management Center CR.
+The following are the required field to configure the LDAP Security provider.
+
+[cols="30%m,70%a"]
+|===
+|Field|Description
+
+|`credentialsSecretName`
+| The name of the secret that contains `username` and `password` keys of a user that has admin privileges on the LDAP server. The `username` must be the DN of the user. It is used to connect to the server when authenticating users.
+
+|`userDn`
+| DN to be used for searching users.
+
+|`groupDn`
+| DN to be used for searching groups.
+
+|`adminGroups`
+| Members of these groups and its nested groups have admin privileges on the Management Center.
+
+|`userGroups`
+| Members of these groups and its nested groups have read and write privileges on the Management Center.
+
+|`readonlyUserGroups`
+| Members of these groups and its nested groups have only read privilege on the Management Center.
+
+|`metricsOnlyGroups`
+| Members of these groups and its nested groups have the privilege to see only the metrics on the Management Center.
+
+|`userSearchFilter`
+| LDAP search filter expression to search for the users.
+
+|`groupSearchFilter`
+| LDAP search filter expression to search for the groups.
+
+|===
+
+=== Example Management Center LDAP configuration
+
+Bellow is the example configuration for the LDAP Security Provider
+
+[source,yaml,subs="attributes+"]
+----
+include::ROOT:example$/management-center-ldap.yaml[]
+----