Add troubleshooting documentation for Test Explorer

Author: ocallesp

docs/csharp/cs-dev-kit-faq.md

@@ -193,6 +193,21 @@ C# Dev Kit requires that it has built your project successfully before tests wil
 
 Build your solution by right-clicking on the solution in the Solution Explorer and select **Build** or `kb(workbench.action.tasks.build)`. Once the build has been completed, your tests will appear in the Test Explorer panel.
 
+### How do I collect logs for troubleshooting issues with Test Explorer?
+
+If you are encountering issues with Test Explorer, you can enable diagnostic logging to gather more information for troubleshooting:
+1. Increase Test Explorer Verbosity:
+Navigate to the C# Dev Kit settings and increase the Test Explorer Verbosity setting from minimal to diagnostic. This will generate more detailed logs.
+2. Check the Output Window:
+Open the Output window in Visual Studio Code, and select C# Dev Kit - Test Explorer from the dropdown. Diagnostic messages will appear with a [dev] prefix.
+3. Collect the Following Information:
+   When reporting an issue, ensure you include:
+   - The diagnostic logs from the Output window.
+   - Your operating system (e.g., Windows 10, macOS 13).
+   - The version of the C# Dev Kit extension you are using.
+
+This information will help in diagnosing and resolving the issue more efficiently.
+
 ## Debugger
 
 ### When I F5, nothing happens