Create Security.MD for GitHub's new Security Tab

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+If you believe you’ve found a security vulnerability in HandBrake or our website (https://handbrake.fr)please send details to us by emailing security /at/ handbrake /dot/ fr
+
+Contributors to this project are also available in [#handbrake on Freenode IRC](https://webchat.freenode.net/?channels=handbrake) (irc://irc.freenode.net/#handbrake).
+Please note, #handbrake and #handbrake-dev are public so details should only be send to contributors via private message.
+
+
+## Responsible Disclosure
+
+We kindly ask that you use responsible disclosure practices when alerting us to any security related issues.
+This allows us time to investigate and take corrective action where necessary. 
+
+Our goal is to deal with any issues reported as quickly as possible.  If you do not receive a direct response from us within 24 hours, please follow up with us as we may not have received the message.
+
+
+## Supported Versions
+
+We accept bug reports (including security reports) for the following versions:
+
+| Version            | Supported          |
+| ------------------ | ------------------ |
+| 1.2.2              | :white_check_mark: |
+| 1.2.1              | :white_check_mark: (Linux Only) |
+| Earlier Releases   | :x:                |