Create SECURITY.md

Author: Arinerron

SECURITY.md

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+**Table of Contents**  *generated with [DocToc](https://github.com/thlorenz/doctoc)*
+
+- [Security Policy](#security-policy)
+  - [Reporting a Vulnerability](#reporting-a-vulnerability)
+
+# Security Policy
+
+## Reporting a Vulnerability
+
+Please report (suspected) security vulnerabilities to
+**[rctf@arinerron.com](mailto:rctf@arinerron.com)**. You will receive a response from
+us within 48 hours. If the issue is confirmed, we will release a patch as soon
+as possible depending on complexity. Your email will be forwarded to all
+applicable rctf maintainers.