add copyright information

[cimendes]

This PR adds copyright information of the FlowCraft project.

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This change is 

[codecov-io]

Codecov Report

Merging #216 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #216   +/-   ##
=======================================
  Coverage   41.95%   41.95%           
=======================================
  Files          72       72           
  Lines        6461     6461           
=======================================
  Hits         2711     2711           
  Misses       3750     3750

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