docs: add writeFile example

[KyleTryon]

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[Jaryt]

Great improvement 👍

[codecov]

Codecov Report

Base: 96.15% // Head: 96.15% // No change to project coverage 👍

Coverage data is based on head (85cd254) compared to base (891c8d5).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #159   +/-   ##
=======================================
  Coverage   96.15%   96.15%           
=======================================
  Files          61       61           
  Lines         676      676           
  Branches       69       69           
=======================================
  Hits          650      650           
  Misses         11       11           
  Partials       15       15           

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[EricRibeiro]

LGTM