Add devcontainer file

[dkmiller]

https://github.com/orgs/community/discussions/73403#discussioncomment-7475535

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📚 Documentation preview 📚: https://ptah--44.org.readthedocs.build/en/44/

[github-actions]

Test Results

55 tests  ±0   55 ✅ ±0   10s ⏱️ -1s
 1 suites ±0    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit 12cbae8. ± Comparison against base commit c7bd3d9.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.33%. Comparing base (c7bd3d9) to head (12cbae8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #44   +/-   ##
=======================================
  Coverage   85.33%   85.33%           
=======================================
  Files          28       28           
  Lines         832      832           
=======================================
  Hits          710      710           
  Misses        122      122           

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