chore: add SECURITY.md and SUPPORT.md

[shenxianpeng]

Fixes item #9 from plan

Adds two org-wide default documents:

SECURITY.md — Security vulnerability reporting policy using GitHub's private vulnerability reporting.

SUPPORT.md — Support channels: documentation site, GitHub Issues per repo, and org-level GitHub Discussions.

These will be automatically displayed on any cpp-linter repo that doesn't have its own.

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⚙️ Run configuration

Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between b82b310 and f2d73f5.

📒 Files selected for processing (2)

• SECURITY.md
• SUPPORT.md

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[shenxianpeng]

SECURITY.md and SUPPORT.md look good to me. going to merge.