🔐 Add a security policy and a well-known security URI

[Abbe98]

Description

This adds a security policy and a well-known security URI pointing people to GitHub's "Private vulnerability reporting" feature.

PR Details

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Code refactor

Checklist

Please ensure the following before submitting the PR:

• I have tested the changes locally, and they work as expected.
• The code follows the project's coding standards and conventions.
• Any query changes have been verified and are working correctly.
• I have updated relevant documentation (if needed).
• I have added unit tests or performed manual testing where necessary.

[Ainali]

Excellent! I'll make a commit to this branch updating the Standard for Public Code assessment too.