Add minimal add-in playgrounds and orchestrator

officeaddin/Create Job Folder/backend/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "backend",
+  "version": "1.0.0",
+  "description": "",
+  "main": "server.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node server.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@azure/msal-node": "^3.8.4",
+    "body-parser": "^2.2.1",
+    "cors": "^2.8.5",
+    "dotenv": "^17.2.3",
+    "express": "^5.2.1",
+    "node-fetch": "^2.6.7"
+  },
+  "devDependencies": {
+    "nodemon": "^3.1.11"
+  }
+}