feat: add main feat

[34j]

Description of change

copilot:all

Pull-Request Checklist

• [ ] Code is up-to-date with the main branch
• [ ] This pull request follows Contributing.md
• [ ] This pull request links relevant issues as Fixes #0000
• [ ] pre-commit run -a passes with this change
• [ ] poetry run pytest passes with this change
• [ ] There are new or updated unit tests validating the change
• [ ] Documentation has been updated to reflect this change
• [ ] The new commits follow conventions outlined in the conventional commit spec

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@74ddcfa). Click here to learn what that means. The diff coverage is 27.77%.

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@@           Coverage Diff           @@
##             main       #1   +/-   ##
=======================================
  Coverage        ?   29.72%           
=======================================
  Files           ?        3           
  Lines           ?       37           
  Branches        ?       10           
=======================================
  Hits            ?       11           
  Misses          ?       26           
  Partials        ?        0           

Impacted Files	Coverage Δ
src/pdfdecrypt/__main__.py	0.00% <0.00%> (ø)
src/pdfdecrypt/__init__.py	100.00% <100.00%> (ø)
src/pdfdecrypt/_main.py	100.00% <100.00%> (ø)

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