Added security policy

SECURITY.md

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+# Security Policy
+
+This document provides an overview of the security policy of Seldon Core.
+
+Seldon Core aims to follow the two following policies:
+
+* Keep dependencies up to date
+* Identify and address common vulnerabilities and exposures 
+
+## Supported Versions
+
+The versions that support this Security policies are the following
+
+| Version  | Supported          |
+| -------  | ------------------ |
+| >= 1.2.2 | :white_check_mark: |
+| < 1.2.2  | :x:                |
+
+## Reporting a Vulnerability
+
+If you identify a vulnerability the best way to report it is by opening an issue with the type "bug". The discussion can then take place there on next steps (ie updating library, reaching out to 3rd party projects, etc).
+