Added SUPPORT.md (#8559)

Co-authored-by: Reuben Bond <[email protected]>

SUPPORT.md

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+# Support
+
+## How to file issues and get help  
+
+This project uses GitHub [Issues](https://github.com/dotnet/orleans/issues) to track bugs and feature requests. Please search the existing 
+issues before filing new issues to avoid duplicates. For new issues, file your bug or feature request as a [new Issue](https://github.com/dotnet/orleans/issues/new).
+
+## Community
+
+The Orleans community enjoys a lively discussion on our [Discord server](https://aka.ms/orleans-discord), and in the Issues customers file here on GitHub. If you would like to engage with our active, friendly community, use one of the links below to find someone who can help. 
+
+[![Discord](https://discordapp.com/api/guilds/333727978460676096/widget.png?style=banner4)](https://aka.ms/orleans-discord)
+
+* Ask questions by [opening an issue on GitHub](https://github.com/dotnet/orleans/issues) or on [Stack Overflow](https://stackoverflow.com/questions/ask?tags=orleans)
+* [Chat on Discord](https://aka.ms/orleans-discord)
+* Follow the [@msftorleans](https://twitter.com/msftorleans) Twitter account for Orleans announcements.
+* [OrleansContrib - GitHub organization for community add-ons to Orleans](https://github.com/OrleansContrib/) Various community projects, including Monitoring, Design Patterns, Storage Providers, etc.
+* Guidelines for developers wanting to [contribute code changes to Orleans](CONTRIBUTING.md).
+* You are also encouraged to report bugs or start a technical discussion by starting a new [thread](https://github.com/dotnet/orleans/issues) on GitHub.
+
+## Microsoft Support Policy  
+
+Support for this project is limited to the resources listed above.