Confirm vscode, nodejs and npm are correctly installed.

verify-local-env.ps1

$nodeVersion = node -v
Write-Host "Node.js Version: $nodeVersion"
if ($nodeVersion -eq $null) {
  Write-Host "Node.js is not installed."
  exit 1
}

$npmVersion = npm -v
Write-Host "npm Version: $npmVersion"
if ($npmVersion -eq $null) {
  Write-Host "npm is not installed."
  exit 1
}

$vsCodeVersion = code -v
Write-Host "Visual Studio Code Version: $vsCodeVersion"
if ($vsCodeVersion -eq $null) {
  Write-Host "Visual Studio Code is not installed."
  exit 1
}