Create SECURITY.md

SECURITY.md

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+# Project Security
+
+</div>
+
+## Security Policy
+We attach great importance to the security of our users data, but we are humans and not infallible.
+That's why we rely on you, the open source contributors, to inform us about actual and possible security vulnerabilities.
+Please follow the guideline below to get in touch with us, even if you're not sure, if your issue is regarding the data security.
+
+## Reporting a Vulnerability
+**Please do not open GitHub issues for security vulnerabilities, as GitHub issues are publicly accessible!**
+
+Instead, contact us per mail (<EMAIL_COMING_SOON>).
+We guarantee a response within two workdays and a security patch as fast as possible.
+
+Thanks for your cooperation and your understanding.
+