message: Add the command in the issue template
diff: -Please prefer filing issues through the in-built extension command `CSharp: Start authoring a new issue on GitHub`. Know more - https://github.com/OmniSharp/omnisharp-vscode/wiki/Reporting-Issues.
  +<!-- To prefill this information:
  +1. Open Visual Studio Code
  +2. Bring up the command palette (press <kbd>F1</kbd>)
  +3. Type `CSharp: Report an issue`
  +
  +If the `CSharp: Report an issue` command doesn't appear, make sure that you have C# extension version 1.17.0 or newer installed.
  +-->
  ## Environment data
  `dotnet --info` output:
  