Add minimal add-in playgrounds and orchestrator

officeaddin/Create Job Folder/backend/health-poller.ps1

@@ -0,0 +1,11 @@
+$ErrorActionPreference = 'Continue'
+while ($true) {
+  $t = (Get-Date).ToString('o')
+  try {
+    $r = curl.exe -k https://localhost:3001/health 2>&1
+    Write-Output "$t - $r"
+  } catch {
+    Write-Output "$t - ERROR: $_"
+  }
+  Start-Sleep -Seconds 10
+}