add security notes

.github/ISSUE_TEMPLATE/02-security-report.md

@@ -0,0 +1,20 @@
+---
+name: Security report
+about: Create a report related to security issues
+title: ''
+labels: security
+assignees: ''
+
+---
+
+## Summary
+
+A clear and concise description of what the issue is.
+
+### Steps to reproduce
+
+Steps to reproduce the behavior (commands, environment etc).
+
+### Intended impact
+
+Brief optional description of how this vulnerability can be used and which effects can be achieved.