Add file write to docs and fixes

[joaquimg]

close #16

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.03%. Comparing base (dad3c7e) to head (a99762c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   97.02%   97.03%   +0.01%     
==========================================
  Files           5        5              
  Lines        1042     1046       +4     
==========================================
+ Hits         1011     1015       +4     
  Misses         31       31              

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