add SECURITY policy file

[starius]

It refers to LND Security policy and asks not to open Github issues for security and privacy issues.

Pull Request Checklist

• Update release_notes.md if your PR contains major features, breaking changes or bugfixes

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a formal security policy to the repository. The primary purpose is to ensure that security and privacy vulnerabilities are handled through appropriate, non-public channels rather than the standard issue tracker, aligning the project's security practices with established standards.

Highlights

• Security Policy Implementation: Added a new SECURITY.md file to provide clear instructions for reporting vulnerabilities.
• Documentation Update: Updated the README.md to direct users away from public GitHub issues for security-related disclosures.

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[gemini-code-assist]

Code Review

This pull request establishes a security policy for the repository by adding a new SECURITY.md file and updating the README.md with instructions for responsible vulnerability disclosure. The review feedback suggests formatting the README update for better visibility and using a more stable link to the external security policy in the SECURITY.md file.

[hieblmi]

LGTM!