Added SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Last stable version of MONARC always provides security updates.
+
+## Reporting a Vulnerability
+
+If you think you have found a potential security issue in MONARC, do not open
+directly a GitHub issue. Please email us. You can contact
+[info@cases.lu](mailto:info@cases.lu).
+
+You can also specify how you would like to be credited for your finding
+(commit message, release notes or blog post for the new release). We will
+respect your privacy and will only publicize your involvement if you
+grant us permission.