docs: add example for variable fonts

[ricardogobbosouza]

Resolve #164

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9722275) 89.51% compared to head (e08dc43) 89.51%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #170   +/-   ##
=======================================
  Coverage   89.51%   89.51%           
=======================================
  Files           1        1           
  Lines         229      229           
  Branches       22       22           
=======================================
  Hits          205      205           
  Misses         24       24           

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