Add initial security policy

SECURITY.md

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+# Security Policy
+
+We endeavour to respond to and patch high-severity security vulnerabilities as soon as we possibly can, however we are currently unable to provide a guaranteed timeframe for a course of action.
+
+## Supported Versions
+
+The following NamelessMC releases are supported by the development team
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.0.0-pr10   | :white_check_mark: |
+| <= 2.0.0-pr9   | :x:                |
+| 1.0.21  | :white_check_mark: |
+| <= 1.0.20   | :x:                |
+
+## Reporting a Vulnerability
+
+Currently, the best place to report a vulnerability is either via email or Discord.
+
+- Email address: samerton7@gmail.com (temporary - we'll get a fancy one set up in the near future)
+- Discord server: https://discord.gg/nameless -> Samerton#9433