docs: create a security policy (#364)

Author: arnaudbesnier

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+To report a security vulnerability, please use the [Forest Admin security email](mailto:[email protected]).
+
+Our technical team will consider your request carefully.
+
+If the vulnerability report is accepted, Forest Admin will:
+- work on a fix of the current version with the highest priority,
+- let you know as soon as a new patched version is published.