Create SECURITY.md

Author: matt335672

SECURITY.md

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+# Security Policy
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+## Reporting a Vulnerability
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+Please DO NOT report any security issues to public GitHub issue.
+
+If you find a security vulnerability please kindly inform us about the problem immediately so that we can fix the security problem to protect a lot of users around the world as soon as possible.
+
+Our email address for security report is below. This is a private mailing list and not open for public viewing. Please include your GitHub account when reporting a vulnerability to this email address if possible. Then we core team can invite you to private pull requests and reporters can join the code review.
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+- xrdp-core@googlegroups.com