I believe that there is a way to have pre-made credits, but I don't know how to. I am using Harlowe. I saw a question on this website asking how to edit the credits and customise them to make them you're own, but this was in Sugarcube so I don't know if it can be done in Harlowe.
Also, if it can, could you tell me how to edit them as well please?
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This comment in the Using Sidebar in Harlowe... thread contains information and links about creating your own side-bar area.