Use preferences.jl, document PAT

[kescobo]

Closes #14, #15

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 76.37%. Comparing base (764d019) to head (3573ed0).

❗ Current head 3573ed0 differs from pull request most recent head 6c67691. Consider uploading reports for the commit 6c67691 to get more accurate results

Files	Patch %	Lines
src/auth.jl	60.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
- Coverage   76.85%   76.37%   -0.49%     
==========================================
  Files           4        5       +1     
  Lines         121      127       +6     
==========================================
+ Hits           93       97       +4     
- Misses         28       30       +2     

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