docs: Add Used By section to README

[shenxianpeng]

Summary

Adds a Used By section to the README using the same compact avatar-and-name style as cpp-linter-action.

The section highlights a few public users of cpp-linter-hooks and links many more to GitHub code search results, so maintainers do not need to curate every usage request through PRs.

Validation

• uvx prek run --files README.md

Note: ./.venv/bin/pre-commit run --files README.md failed because the local pre-commit version does not accept the current hook manifest stages: pre-commit value.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6e59a552-6157-4673-981b-4a72e99b0f07

📥 Commits

Reviewing files that changed from the base of the PR and between fab85d9 and b8a0e8f.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/add-used-by-section

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.07%. Comparing base (fab85d9) to head (b8a0e8f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #229   +/-   ##
=======================================
  Coverage   97.07%   97.07%           
=======================================
  Files           4        4           
  Lines         239      239           
=======================================
  Hits          232      232           
  Misses          7        7           

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