Create SECURITY.md

Signed-off-by: Ryan <[email protected]>

Author: ryanlua

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Signs provides **security updates to all versions to it's plugins**.
+
+| Version   | Supported          |
+| --------- | ------------------ |
+| Signs     | :white_check_mark: |
+| Signs Free| :white_check_mark: |
+
+## Reporting a Vulnerability
+
+**To report a security vulnerability** fill out a [draft security advisory](https://github.com/The-Winner-Games/Signs/security/advisories/new).