docs: show absolute output path usage

[therunnas]

Summary

• Document that reportFilename and statsFilename can be absolute paths
• Add a small plugin example using path.resolve(...) for report and stats output paths

Closes #186.

Checks

• npx --yes prettier@3.8.0 --check README.md
• git diff --check

[changeset-bot]

⚠️ No Changeset found

Latest commit: 148aec8

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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: therunnas / name: therunnas (148aec8)

[alexander-akait]

Please accept CLA

[valscion]

Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.30%. Comparing base (9ba43c7) to head (148aec8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #716   +/-   ##
=======================================
  Coverage   76.30%   76.30%           
=======================================
  Files          17       17           
  Lines         979      979           
  Branches      357      357           
=======================================
  Hits          747      747           
  Misses        205      205           
  Partials       27       27           

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