Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Only the latest version of the product is supported. This version can be accessed at https://app.keeweb.info 
+and downloaded from https://keeweb.info or GitHub releases ([latest release link](https://github.com/keeweb/keeweb/releases/latest)).
+
+## Reporting a Vulnerability
+
+We would appreciate [responsible disclosure](https://en.wikipedia.org/wiki/Responsible_disclosure).
+If you would like to report a vulnerability, the preferred way to do so is [contacting the developer directly](mailto:antelle.net@gmail.com).