[ENH] Add CC0 license by default to all outputs

[Remi-Gau]

closes #887

[codecov]

Codecov Report

Merging #898 (97b30e8) into main (ac7a0a9) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #898      +/-   ##
==========================================
+ Coverage   78.48%   78.51%   +0.02%     
==========================================
  Files         241      242       +1     
  Lines        6465     6473       +8     
  Branches       40       40              
==========================================
+ Hits         5074     5082       +8     
  Misses       1375     1375              
  Partials       16       16              

Flag	Coverage Δ
cli	38.31% <ø> (ø)
matlab	80.11% <100.00%> (+0.02%)	⬆️
octave	78.68% <100.00%> (+0.02%)	⬆️

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Impacted Files	Coverage Δ
src/IO/addGitIgnore.m	100.00% <100.00%> (ø)
src/IO/addLicense.m	100.00% <100.00%> (ø)
src/IO/addReadme.m	50.00% <100.00%> (+10.00%)	⬆️
src/bids/initBids.m	100.00% <100.00%> (ø)

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