Document path resolution for CLI list files

[dieJaegerIn]

Noted in the --help text of -f that paths listed in a file containing filenames passed to -f are opened relative to the working directory and add a worked example to the CLI tutorial.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.37%. Comparing base (7cb430c) to head (8b0989e).

Additional details and impacted files

@@               Coverage Diff                @@
##           polish-tutorial      #42   +/-   ##
================================================
  Coverage            89.37%   89.37%           
================================================
  Files                   11       11           
  Lines                  612      612           
================================================
  Hits                   547      547           
  Misses                  65       65           

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[dieJaegerIn]

Addresses the CLI input-file path issue raised in the review