Module::Manifest::Skip should have been installed with Module::Package.

From the documentation for Module::Manifest::Skip :

"CPAN module authors use a MANIFEST.SKIP file to exclude certain well known files from getting put into a generated MANIFEST file, which would cause them to go into the final distribution package."

"Module::Manifest::Skip can create or update a MANIFEST.SKIP file for you...."

"This module ships with a share file called share/MANIFEST.SKIP. This is the basis for all new MANIFEST.SKIP files."

I've never packaged a Module before, but hopefully this should set you on the right track.
The Module's CPAN page has a dependency listing and contact info.