Send e-mail when user is added to group 'jira-administrator' via listener.

[Nate _이슬기_ _Project Management_ _]

Dear Sir,

I'd like to create the listener as follows features:

1. When: The user is added to group 'jira-administrator'
2. action: send-email

Do you mind helping me 'Condition and Configuration' coding? it is very hard for me...

Regards,
Nate.