This is easier than you think, clone this project and:
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just type your file project name adding the plist
touch myProject.xcodeproj/.xcodesamplecode.plist
1.1) and if you have a workspace:
touch myProject.xcworkspace/.xcodesamplecode.plist
The only thing is that you won't be avable to edit the markdown file inside xcode...use another markdown editor and done!