Created security policy.

SECURITY.md

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+# Security Policy
+
+We only support the latest official relese version with respect to security vulnerabilities, thus only the latest or then the upcoming next release version
+will receive vulnerability fixes and security updates. A vulnerability may however be reported for any version, unless it already has been fixed with a later
+release version.
+
+## Reporting a Vulnerability
+
+> [!IMPORTANT]
+> - Please _always_ consult the documentation first before creating a vulnerability report: https://safeexambrowser.org/windows/win_usermanual_en.html.
+> - Please _always_ verify that no later release version exists which possibly fixes the vulnerability.
+> - Please _always_ attach the log file(s) of the affected session(s)! They can be found under `%LocalAppData%\SafeExamBrowser\Logs`.
+
+**Describe the Vulnerability**
+A clear and concise description of what the vulnerability is.
+
+**Steps to Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected Behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Version Information**
+ - OS: [e.g. Windows 10 Professional, Version 1803]
+ - SEB-Version [e.g. SEB 3.0.1]
+
+**Additional Context**
+Add any other context about the problem here.