Add security policy (#797)

Signed-off-by: Pedro Kaj Kjellerup Nacht <pnacht@google.com>

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 me 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.
+
+Please submit information on the vulnerability as a
+[private report](https://github.com/libfuse/libfuse/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 a single volunteer on a reasonable-effort basis. As such,
+I ask that you give me 90 days to work on a fix before public exposure.
+
+Note we are aware of a long-standing security issue when using `allow_others` (see
+[#15](https://github.com/libfuse/libfuse/issues/15)).
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