Add SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Because of limited resources and general compatibility
+between versions only the [latest release](https://github.com/dompdf/php-svg-lib/releases) 
+of SVGLib is actively supported.
+
+## Reporting a Vulnerability
+
+In order to give the community time to respond and patch 
+we strongly urge you report all security issues privately. 
+New vulnerabilities can be reported through the GitHub
+[Security Advisories](https://github.com/dompdf/php-svg-lib/security/advisories) 
+feature. If you have any questions email us at [email protected] and 
+we will respond ASAP.