Creating common security policy

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The .NET Core and ASP.NET Core support policy, including supported versions can be found at the [.NET Core Support Policy Page](https://dotnet.microsoft.com/platform/support/policy/dotnet-core).
+
+## Reporting a Vulnerability
+
+Security issues and bugs should be reported privately, via email, to the Microsoft Security Response Center (MSRC) [email protected]. 
+You should receive a response within 24 hours. If for some reason you do not, please follow up via email to ensure we received your 
+original message. Further information, including the MSRC PGP key, can be found in the [Security TechCenter](https://technet.microsoft.com/en-us/security/ff852094.aspx).
+
+Reports via MSRC may qualify for the .NET Core Bug Bounty. Details of the .NET Core Bug Bounty including terms and conditions are at [https://aka.ms/corebounty](https://aka.ms/corebounty).
+
+Please do not open issues for anything you think might have a security implication.