Improve documentation for CSV import by providing sample file

I am trying to automate the generation of task lists and build a pipeline for importing them to my project. The documentation on this could use some improvement: https://quire.io/guide/import-quire-csv/

Specifically, it would be helpful if you provided the exact format for the Quire CSV import file. It appears to be different than the export format - I tested exporting a project and importing it and the parent-child relationships were lost in the process.

My best guess at the import format was: ID,Parent,Name,Description,Priority,Status,Start,Due,Assignee,Tag

But testing this format proved to be unsuccessful as I didn't end up importing any tags.