Create SECURITY.md

added a security policy

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version               | Account                                       | Supported |
+| --------------------- | --------------------------------------------- |---------- |
+| Production            | Suggester#8366 (`564426594144354315`)         | Yes       |
+| Canary                | Suggester Canary#8420 (`618458376224899073`)  | Yes       |
+| Production 2          | Suggester 2#6730 (`708299727166242866`)       | Yes       |
+| Self-hosted Instances | /                                             | No        |
+
+
+## Reporting a Vulnerability
+
+All data and bot services are protected by authentication and access is limited to a small subset of users (developers and, for some data, Suggester Staff members). If you believe you have found a security issue in one of our systems, do **not** post in a public chat. DM a Developer (`Brightness#0001` or `Ben!#0002`) on Discord with information and we will investigate.