Create SECURITY.md

Talk about security a little

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+We currently don't have online multiplayer publically available,
+therefor security isn't a major issue nor a priority right now.
+
+Online multiplayer is being designed p2p style (peer-to-peer), so
+for a while, security will be rather bad until we fully focus on it.
+
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.5.x   | :white_check_mark: |
+| 0.4.x   | :x:                |