added support.md file

Author: mikadumont

SUPPORT.md

@@ -0,0 +1,11 @@
+# Support
+
+## How to file issues and get help
+
+This project uses GitHub Issues to track bugs and feature requests. Please search the [existing issues](https://github.com/dotnet/vscode-csharp/issues) before filing new issues to avoid duplicates. For new issues, file your bug or feature request as a new Issue.
+
+For help and questions about using this project, please see the [README](https://github.com/dotnet/vscode-csharp/blob/main/README.md).
+
+## Microsoft Support Policy
+
+Support for this project is limited to the resources listed above.