Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+<!--
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 5.1.x   | :white_check_mark: |
+| 5.0.x   | :x:                |
+| 4.0.x   | :white_check_mark: |
+| < 4.0   | :x:                |
+
+/-->
+
+
+## Reporting a Vulnerability
+
+To report a vulnerability, please open an issue here: <https://github.com/madpah/serializable/issues/new>  
+In case of a security issue, please di not disclose publicly, until it is fixed, just mention this fact in an issue, and we will contact you with information on which mehtod/channel to communicate.