add pm2 start script file

+{
+    "apps": [
+        {
+            "name": "yohobuy-portal",
+            "script": "index.js",
+            "instances": "max",
+            "exec_mode": "cluster",
+            "merge_logs": true,
+            "log_data_format": "YYYY-MM-DD HH:mm Z",
+            "env": {
+                "PORT": 30012,
+                "TZ": "Asia/Shanghai"
+            }
+        }
+    ]
+}