Add redmine module (wiki)

I manage tasks using redmine.
I would like a module that can input two textiles into one project.
wiki is an image with multiple tabs, one of which is a guideline content
I would like to use the other as a wiki for sharing information.
Is it possible to redmine things like this?
Or, I would like to know if there are any major plug-ins that add modules that can edit textile.

Thank you for your cooperation.