Need help with developing own Crowd plugin implementation of Delegated Authentication Directory

Crowd Development
1

Hi all,
we need to have own plugin with implementation of DelegatedAuthenticationDirectory
per my understanding this sould be class
extends AbstractForwardingDirectory implements RemoteDirectory
https://docs.atlassian.com/atlassian-crowd/3.1.2/com/atlassian/crowd/directory/AbstractForwardingDirectory.html

What should I place to the pom file to have ability to
import com.atlassian.crowd.directory.AbstractForwardingDirectory;
?

Can’t find artifact for this at https://mvnrepository.com/artifact/com.atlassian.crowd?p=1