add pm2

pm2.json

+{
+    "apps": [
+        {
+            "name": "dm8-connect",
+            "script": "app.js",
+            "cwd": "./",
+            "log_date_format": "YYYY-MM-DD HH:mm:ss",
+            "time": true,
+            "env": {
+                "NODE_ENV": "development",
+                "PORT": 8829,
+                "TZ": "Asia/Shanghai"
+            },
+            "out_file": "./logs/pm2.log",
+            "error_file": "./logs/pm2-error.log"
+        }
+    ]
+}
\ No newline at end of file