(maint) Add sync.yml to enable modsync
(maint) Add sync.yml to enable modsync

Previously the puppetlabs-windows module was not being managed by modsync which
means that automated releases could not be performed.  This commit adds a
sync.yml file in preparation to bring the module under modsync control.  Note
that this is a meta-module so there is no CI that occurs.

puppetlabs/puppetlabs-windows