docs: add SECURITY.md

Signed-off-by: Diana Lau <[email protected]>

SECURITY.md

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+# Security Policy
+
+## Security advisories
+
+Security advisories can be found on the
+[LoopBack website](https://loopback.io/doc/en/sec/index.html).
+
+## Reporting a vulnerability
+
+If you think you have discovered a new security issue with any LoopBack package,
+**please do not report it on GitHub**. Instead, send an email to
+[[email protected]](mailto:[email protected]) with the following details:
+
+- Full description of the vulnerability.
+- Steps to reproduce the issue.
+- Possible solutions.
+
+If you are sending us any logs as part of the report, then make sure to redact
+any sensitive data from them.