feat: add security policy inline with python.org page and similar repos

Author: JacobCoffee

SECURITY.md

@@ -0,0 +1,10 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+Please read the guidelines on reporting security issues [on the
+official website](https://www.python.org/dev/security/) for
+instructions on how to report a security-related problem to
+the Python team responsibly.
+
+To reach the response team, email `security at python dot org`.