add security policy content

Author: msamsami

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+If you think you found a vulnerability, and even if you are not sure about it, please report it right away by sending an email to: `igor.magalhaes.r at gmail dot com`. Please try to be as explicit as possible, describing all the steps and example code to reproduce the security issue.
+
+## Vulnerability Disclosures
+
+Critical vulnerabilities will be disclosed via GitHub's [security advisory](https://github.com/benavlabs/crudadmin/security) system.
+
+## Public Discussions
+
+Please restrain from publicly discussing a potential security vulnerability.
+
+It's better to discuss privately and try to find a solution first, to limit the potential impact as much as possible.
+
+---
+
+Thanks for your help!