Add CUDA usage example

[mborland]

No description provided.

[cppalliance-bot]

An automated preview of the documentation is available at https://372.int128.prtest3.cppalliance.org/libs/int128/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-03-25 20:00:06 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.90%. Comparing base (064e208) to head (fac932e).
⚠️ Report is 7 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #372   +/-   ##
========================================
  Coverage    98.90%   98.90%           
========================================
  Files           66       66           
  Lines         5551     5551           
  Branches      1767     1767           
========================================
  Hits          5490     5490           
  Misses          30       30           
  Partials        31       31           

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