How to add another column to the issues table report?

I would like to know if someone can help me to determine what steps I do need to modify redmine in the table shown at the url

I need to add another column, lets say "close date", where it reports the last date on which an issue became closed state.

as I understand redmine, the matter is to return the field created_on of the journal whose journal_details change to status_id = 5

and the change would be somewhere in issues_controller, but given my ignorance on ruby and ruby on rails I feel lost...

so any help would be very valuable

Thank you.

Redmine