docs: add a Sponsors section to the README

[shenxianpeng]

Summary

Before: the README said nothing about sponsoring the project.

After: a short "Sponsors" section before "Contributing" links to the website sponsor page, GitHub Sponsors and Open Collective, and says Silver and Gold sponsors get their logo there.

How: one new section in README.md.

Related Issues

Part of the sponsor-tiers change in cpp-linter/cpp-linter.github.io.

Summary by CodeRabbit

• Documentation
  • Added a Sponsors section with links to sponsorship options and details about logo displays for Silver and Gold sponsors.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 18feb1bf-0e75-4521-b8eb-0f7b6f4ccec3

📥 Commits

Reviewing files that changed from the base of the PR and between e60efd4 and 129a864.

📒 Files selected for processing (1)

• README.md

🚧 Files skipped from review as they are similar to previous changes (1)

• README.md

Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 1 remain after this review.

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Walkthrough

The README adds a Sponsors section. It states that two volunteers maintain cpp-linter, links to the project sponsorship page and Open Collective, and notes that Silver and Gold sponsors receive logo placement.

Changes

Sponsorship information

Layer / File(s)	Summary
README sponsorship section README.md	The README states that two volunteers maintain cpp-linter, links to sponsorship options, and notes that Silver and Gold sponsors receive logo placement.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 129a8

This is a documentation-only change that adds sponsorship links to the README. It has no effect on runtime behavior and is safe to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely describes the main change: adding a Sponsors section to the README.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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