Create SECURITY.md

Author: notesjor

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The following versions of CorpusExplorer are updated approximately once per quarter:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.0.x   | :white_check_mark: |
+| 1.0.x   | :x:                |
+
+## Reporting a Vulnerability
+
+If you find a bug or security vulnerability, please send the information directly to me. 
+My contact details - as well as information about secure transmission can be found here:
+https://notes.jan-oliver-ruediger.de/kontakt/