symtegration-0.6.1: docs/SECURITY.md

# Security Policy

## Reporting a vulnerability

To report a security bug, submit details such as what the vulnerability is,
what risks it may entail, and how to reproduce it [via GitHub].
I will try to respond and deal with the issue within 2 weeks.
Disclosure policy is to disclose a vulnerability within 90 days of it being reported.

[via GitHub]: https://github.com/chungyc/symtegration/security/advisories/new