Added security md (openvinotoolkit#1836)

Author: bstrzele

security.md

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+# Security Policy
+Intel is committed to rapidly addressing security vulnerabilities affecting our customers and providing clear guidance on the solution, impact, severity and mitigation. 
+
+## Reporting a Vulnerability
+Please report any security vulnerabilities in this project [utilizing the guidelines here](https://www.intel.com/content/www/us/en/security-center/vulnerability-handling-guidelines.html).