Update README.md (#9151)

Author: jamesmontemagno

README.md

@@ -4,6 +4,12 @@ Welcome to the home of .NET news & release notes to help you stay up to date wit
 
 Follow our [GitHub Discussions](https://github.com/dotnet/core/discussions), where you will find the latest new on preview releases, service releases, and CVEs for .NET.
 
+You can subscribe to news posts with the following feeds:
+* All Discussions: https://github.com/dotnet/core/discussions.atom
+* News: https://github.com/dotnet/core/discussions/categories/news.atom
+* Security Disclosures (CVEs): https://github.com/dotnet/core/discussions/categories/security-disclosures-cves.atom
+* Sevicing Releases: https://github.com/dotnet/core/discussions/categories/servicing-releases.atom
+
 ## Release Notes
 
 The following [.NET releases](./releases.md) are currently supported: