Create SECURITY.md

[Eikyarkway]

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[Eikyarkway]

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+# Security Policy
+
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version | Supported |
+| ------- | ------------------ |
+| 5.1.x | ✅ |
+| 5.0.x | ❌ |
+| 4.0.x | ✅ |
+| < 4.0 | ❌ |
+
+## Reporting a Vulnerability
+
+Use this section to tell people how to report a vulnerability.
+
+Tell them where to go, how often they can expect to get an update on a
+reported vulnerability, what to expect if the vulnerability is accepted or
+declined, etc.

[Eikyarkway]

#515