📝(docs) add SECURITY.md file

Created SECURITY.md document outlining security policy, vulnerability reporting
process, and responsible disclosure guidelines for the project.

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+Security is very important to us.
+
+If you have any issue regarding security, please disclose the information responsibly submiting [this form](https://vdp.numerique.gouv.fr/p/Send-a-report?lang=en) and not by creating an issue on the repository. You can also email us at visio@numerique.gouv.fr
+
+We appreciate your effort to make Visio more secure.
+
+## Vulnerability disclosure policy
+
+Working with security issues in an open source project can be challenging, as we are required to disclose potential problems that could be exploited by attackers. With this in mind, our security fix policy is as follows:
+
+1. The Maintainers team will handle the fix as usual (Pull Request,
+   release).
+2. In the release notes, we will include the identification numbers from the
+   GitHub Advisory Database (GHSA) and, if applicable, the Common Vulnerabilities
+   and Exposures (CVE) identifier for the vulnerability.
+3. Once this grace period has passed, we will publish the vulnerability.
+
+By adhering to this security policy, we aim to address security concerns
+effectively and responsibly in our open source software project.