Create SECURITY.md (#489)

Author: ndem0

SECURITY.md

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+# Security Policy
+
+Security and bug fixes are generally provided only for the last minor version. Fixes are released either as part of the next minor version or as an on-demand patch version.
+
+Security fixes are given priority and might be enough to cause a new version to be released.
+
+
+## Supported Versions
+
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.2     | ✅                |
+| 0.1     | ✅                |
+
+## Reporting a Vulnerability
+
+To ensure vulnerability reports reach the maintainers as quickly as possible, the preferred way is to use the ["Report a vulnerability"](https://github.com/mathLab/PINA/security/advisories/new) button under the "Security" tab of the associated GitHub project. This creates a private communication channel between the reporter and the maintainers.