Add maintainer to crowd2 plugin

[akouznetchik]

Hello,
I would like to be add by invitation of the current maintainer.

https://github.com/jenkinsci/crowd2-plugin
jenkinsci/crowd2-plugin#169 (comment)

@DuMaM

Release permission checklist (for submitters)

Beta Give feedback

1. The usernames of the users added to the "developers" section in the .yml file are the same the users use to log in to accounts.jenkins.io.
2. All users added have logged in to Artifactory and Jira once.
3. I have mentioned an existing team member of the plugin or component team to approve this request.

Reviewer checklist

Beta Give feedback

1. Check that the $pluginId Developers team has Admin permissions while granting the access.
2. In the case of plugin adoption, ensure that the Jenkins Jira default assignee is either removed or changed to the new maintainer.
3. If security contacts are changed (this includes add/remove), ping the security officer (currently @Wadeck) in this pull request. If an email contact is changed, wait for approval from the security officer.

There are IRC Bot commands for it.