feat(agents): adding some files for better discovery for ai agents

[psachmann]

• Adding CLAUDE.md for better development support with agents
• Adding llms.txt for better agent support for the DotNetQuery.* packages

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.81%. Comparing base (3442fe9) to head (d6314c5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #43   +/-   ##
=======================================
  Coverage   95.81%   95.81%           
=======================================
  Files          21       21           
  Lines         741      741           
  Branches      127      127           
=======================================
  Hits          710      710           
  Misses          5        5           
  Partials       26       26           

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