Add simple arithmetic differences example

[mborland]

No description provided.

[cppalliance-bot]

An automated preview of the documentation is available at https://1273.decimal.prtest3.cppalliance.org/libs/decimal/doc/html/index.html

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

2025-12-08 10:08:03 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.9%. Comparing base (fefc51c) to head (883b289).
⚠️ Report is 10 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1273     +/-   ##
=========================================
- Coverage     98.9%   98.9%   -0.0%     
=========================================
  Files          267     267             
  Lines        17755   17755             
  Branches      1973    1973             
=========================================
- Hits         17550   17549      -1     
- Misses         205     206      +1     

see 1 file with indirect coverage changes

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