chore: add security readme (#489)

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,8 @@
 blank_issues_enabled: false
 contact_links:
+  - name: Security Vulnerability
+    url: https://github.com/payloadcms/payload/blob/master/SECURITY.md
+    about: See instructions to privately disclose any security concerns
   - name: Feature Request
     url: https://github.com/payloadcms/payload/discussions
     about: Suggest an idea to improve Payload in our GitHub Discussions

SECURITY.md

@@ -0,0 +1,5 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+Please report any security issues or concerns to [info@payloadcms.com](mailto:info@payloadcms.com).