Added sample decrypted PPT file for bug testing

[MrCrumbs]

See #31

[codecov-io]

Codecov Report

Merging #33 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #33   +/-   ##
=======================================
  Coverage   86.72%   86.72%           
=======================================
  Files          13       13           
  Lines        1145     1145           
=======================================
  Hits          993      993           
  Misses        152      152

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[nolze]

Reuploaded in #31 (comment)