include example of validating a scoring file header

[nebfield]

Quick example of validating a scoring file header using pydantic, which might be helpful to reuse

[codecov]

Codecov Report

Attention: Patch coverage is 96.07843% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.32%. Comparing base (71f2f90) to head (c280a88).
Report is 2 commits behind head on fix-nonadditive.

Files with missing lines	Patch %	Lines
pgscatalog.core/src/pgscatalog/core/lib/models.py	96.00%	2 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##           fix-nonadditive      #48      +/-   ##
===================================================
+ Coverage            89.18%   89.32%   +0.13%     
===================================================
  Files                   40       40              
  Lines                 2320     2369      +49     
===================================================
+ Hits                  2069     2116      +47     
- Misses                 251      253       +2     

Flag	Coverage Δ
pgscatalog.core	90.37% <96.07%> (+0.21%)	⬆️

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