maint: Add SECURITY.md file

Author: AlejandroFernandezLuces

SECURITY.md

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+# Security Policy
+
+## Reporting a vulnerability
+
+> [!CAUTION]
+> Do not use GitHub issues to report any security vulnerabilities.
+
+If you detect a vulnerability, contact the [PyAnsys Core team](mailto:[email protected]),
+mentioning the repository and the details of your finding. The team will address it as soon as possible.
+
+Provide the PyAnsys Core team with this information:
+
+- Any specific configuration settings needed to reproduce the problem
+- Step-by-step guidance to reproduce the problem
+- The exact location of the problematic source code, including tag, branch, commit, or a direct URL
+- The potential consequences of the vulnerability, along with a description of how an attacker could take advantage of the issue