add a README file to show credits of the sample files.
add a README file to show credits of the sample files.


git-svn-id: f1daae93ec50fd93b15e4810276f299070365e28@223 1aa58f4a-7d42-0410-adbc-911cccaed67c

goulu/pdfminer,pdfminer/pdfminer.six,euske/pdfminer,rotula/pdfminer