doc: add Portuguese tutorial

[AssuncaoAndre]

Issue #267

[codecov]

Codecov Report

Merging #284 (499ea88) into master (611626f) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #284      +/-   ##
==========================================
- Coverage   87.09%   87.09%   -0.01%     
==========================================
  Files          16       16              
  Lines        3821     3819       -2     
  Branches      815      794      -21     
==========================================
- Hits         3328     3326       -2     
  Misses        319      319              
  Partials      174      174              

Impacted Files	Coverage Δ
fpdf/__init__.py	100.00% <0.00%> (ø)

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[Lucas-C]

@allcontributors please add @fuscati for translation

[allcontributors]

@Lucas-C

I've put up a pull request to add @fuscati! 🎉

[Lucas-C]

FYI I mentioned you in this blog article 😉
https://chezsoi.org/lucas/blog/hacktoberfest-on-fpdf2.html