(doc) Update README with better LFN resolution
(doc) Update README with better LFN resolution

This commit adds information about the --module_working_dir parameter
which can be used workaround the long filename issue that can arise
when installing this module.

Ticket: MODULES-3191 and PUP-4854

[skip ci]

Iristyle/puppetlabs-dsc,ConclusionMC/puppetlabs-dsc,cowofevil/puppetlabs-dsc,jpogran/puppetlabs-dsc,ferventcoder/puppetlabs-dsc,Iristyle/puppetlabs-dsc,ferventcoder/puppetlabs-dsc,ferventcoder/puppetlabs-dsc,ConclusionMC/puppetlabs-dsc,ConclusionMC/puppetlabs-dsc,Iristyle/puppetlabs-dsc,ConclusionMC/puppetlabs-dsc,jpogran/puppetlabs-dsc,ferventcoder/puppetlabs-dsc,puppetlabs/puppetlabs-dsc,jpogran/puppetlabs-dsc,Iristyle/puppetlabs-dsc,cowofevil/puppetlabs-dsc,puppetlabs/puppetlabs-dsc,cowofevil/puppetlabs-dsc,puppetlabs/puppetlabs-dsc,ConclusionMC/puppetlabs-dsc