chore: add SECURITY.md

Signed-off-by: Juan Munoz <[email protected]>

Author: juancho0202

SECURITY.md

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+<!--
+SPDX-FileCopyrightText: 2023 Alliander N.V.
+
+SPDX-License-Identifier: Apache-2.0
+-->
+# Security Policy
+
+## Reporting a Vulnerability
+
+Please go to [Security Advisories](https://github.com/com-pas/compas-cim-mapping/security/advisories) to privately report a security vulnerability, 
+our contributors will try to respond within a week of your report with a rough plan for a fix and new tests.