Can't you edit the wiki directly? According to our repo settings (and the github docu), every user with a github account should be able to edit the wiki.So a stand alone tutorial in PDF format is acceptable? Or is putting it in the wiki better?
I want to give something back to MusE.
If it does not work, you can send me your document in the markdown format, I will include it in the wiki (a good external editor for the markdown language is e.g. VSCode, just in case you need one).
Your theme (from the above screenshot) also looks very nice, if it's complete for all views and you would be interested in contributing it to MusE, for me personally it would be a nice addition. Your colour combinations are very tasteful.