Create SECURITY.md

Author: andre-kunz

SECURITY.md

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+# Reporting a Vulnerability
+
+Incoming security reports will be taken seriously and checked on a regular basis.
+If you think you have found a security vulnerability, please report it with the "Report a vulnerability"-form in the "Security" tab.
+
+The project team will then acknowledge, analyze and respond to your report accordingly.
+Please do not publicly disclose any vulnerabilities until they have been analyzed and a fix is available.
+
+Thank you for helping us to make our project more secure.
+