Add SECURITY file

Author: yannickcr

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+This is the list of versions of `eslint-plugin-react` which are currently being supported with security updates.
+
+| Version  | Supported          |
+| -------- | ------------------ |
+| 7.x      | :white_check_mark: |
+| < 7.x    | :x:                |
+
+
+## Reporting a Vulnerability
+
+To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure.