Readme pt-br update

[williamokano]

Updated the pt_BR doc with the integration part, fixed some typos and added the summary (index)

[codecov-io]

Codecov Report

Merging #64 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #64   +/-   ##
=========================================
  Coverage     88.76%   88.76%           
  Complexity      239      239           
=========================================
  Files            18       18           
  Lines           730      730           
=========================================
  Hits            648      648           
  Misses           82       82

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[mikeymike]

Thanks @williamokano !