1. if you believe you can have it ready these days (say it's submitted before Monday) -> 5.15 since the release will be on the 26th of this month.
2. If you want to write a Tutorial, with text and more, sources/pyside2/doc/tutorials/ inside there you need to create a directory (you can just copy other there and replace the text and stuff), if you want to just submit the code as an example: examples/declarative/