Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+These are our supported versions. Please do not report security issues present on unsupported versions, they will be ignored.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.4.9   | :white_check_mark: |
+| < 2.4.8   | :x:                |
+
+## Reporting a Vulnerability
+
+To report a security issue, please use the GitHub Security Advisory ["Report a Vulnerability"](https://github.com/ciderapp/node_airtunes2/security/advisories/new) tab. 
+Please be as descriptive as possible and provide methods to reproduce and screenshots where possible.
+
+We will try our best to handle every security report that comes in, please remember that we are a fairly small team with varying work efforts so bear this in mind when making the report.