Create SECURITY.md

Author: Andre601

SECURITY.md

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+[discord]: https://discord.gg/6dazXp6
+[issues]: https://github.com/botblock/JavaBotBlockAPI/issues/new?labels=Type:+Bug&template=bug_report.md
+
+# Security Policy
+
+## Supported Versions
+We only support the latest major version and only make updates towards those.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 5.x     | :white_check_mark: |
+| 4.x     | :x:                |
+| 3.x     | :x:                |
+| 2.x     | :x:                |
+| 1.x     | :x:                |
+
+## Reporting a Vulnerability
+
+Please report any security issues on the [Discord Server][discord].  
+Any other issue should be reported as usual through the [Issues tab][issues]