Add security policy (#1866)

Signed-off-by: Pedro Kaj Kjellerup Nacht <pnacht@google.com>
Co-authored-by: Martin Matuska <martin@matuska.de>

diff --git a/SECURITY.md b/SECURITY.md
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+# 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 security@libarchive.de; and/or
+- send us a [private vulnerability report](https://github.com/libarchive/libarchive/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 me 90 days to work on a fix before public exposure.