Create SECURITY.md

Signed-off-by: Tiger Wang <tigerwang@outlook.com>

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+CasaOS is currently under active development. Support is limited before CasaOS reaches v1.0.
+
+## Reporting a Vulnerability
+
+If you see any vulnerabiility, email us at wiki@casaos.io