Add security policy (mrdoob#26204)

Signed-off-by: Pedro Kaj Kjellerup Nacht <[email protected]>

Author: pnacht

SECURITY.md

@@ -0,0 +1,19 @@
+# Security Policy
+
+If you have discovered a security vulnerability in this project, please report it
+privately. **Do not disclose it as a public issue.** This gives us time to work with you
+to fix the issue before public exposure, reducing the chance that the exploit will be
+used before a patch is released.
+
+You may submit the report in the following ways:
+
+- send an email to [email protected]; and/or
+- send us a [private vulnerability report](https://github.com/mrdoob/three.js/security/advisories/new)
+
+Please provide the following information in your report:
+
+- A description of the vulnerability and its impact
+- How to reproduce the issue
+
+This project is maintained by volunteers on a reasonable-effort basis. As such,
+we ask that you give us 90 days to work on a fix before public exposure.