Add GeoBR dataset

[juliohm]

Restart from #23

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 46.47887% with 38 lines in your changes missing coverage. Please review.

Project coverage is 46.78%. Comparing base (2751d80) to head (f0f7316).

Files with missing lines	Patch %	Lines
src/geobr.jl	46.47%	38 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
- Coverage   46.83%   46.78%   -0.05%     
==========================================
  Files           4        5       +1     
  Lines         474      545      +71     
==========================================
+ Hits          222      255      +33     
- Misses        252      290      +38     

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