Yes there should be instructions about m2e-wro4j in the readme file, but only for projects using the wro4j-maven-plugin, obviously.

You can't just put it at the root of the QS directory, as quickstarts are imported from JBT/JBDS individually (as single zips)

Anyway, once the project is imported, if the wro4j integration is not installed, the m2e discovery mechanism should find it and ask you to install it