add security.md file

SECURITY.md

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+Reporting Security Issues
+----------------------------------------------------------------------------------------------------------
+We take all security reports seriously. When we receive such reports, we will investigate and 
+subsequently address any potential vulnerabilities as quickly as possible. If you discover a potential 
+security issue in this project, please notify AWS/Amazon Security via our [vulnerability reporting page](http://aws.amazon.com/security/vulnerability-reporting/) or 
+directly via email to [AWS Security](mailto:[email protected]). Please do not create a public GitHub issue in this project.