Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+This project supports its released versions as follows:
+
+- The [latest released version on Pypi](https://pypi.org/project/nocasedict/)
+  gets fixes, including security fixes.
+- Earlier versions are not fixed anymore.
+
+## Reporting a Vulnerability
+
+Please report vulnerabilities via the
+[Security Advisories](https://github.com/pywbem/nocasedict/security/advisories)
+page of this project. This ensures that they are passed on to the maintainers
+privately.
+
+Do not report them as issues or pull requests, since that would reveal the
+vulnerability before the maintainers have a chance to fix it. Note that even
+with a pull request that fixes the vulnerability perfectly, it is revealed
+publicly before a new version of the package can be released to Pypi.