Link troubleshooting guide from SUPPORT.md

Co-authored-by: leestott <2511341+leestott@users.noreply.github.com>

SUPPORT.md

@@ -1,11 +1,16 @@
 # Support
 ## How to file issues and get help  
 
+Before filing an issue, please check our [Troubleshooting Guide](TROUBLESHOOTING.md) for solutions to common problems with installation, setup, and running lessons.
+
 This project uses GitHub 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.
 
-For help and questions about using this project, file an issue.
+For help and questions about using this project, you can also:
+- Check the [Troubleshooting Guide](TROUBLESHOOTING.md)
+- Visit our [GitHub Discussions](https://github.com/microsoft/ML-For-Beginners/discussions)
+- File an issue
 
 ## Microsoft Support Policy