added pm2 config

ecosystem.config.js

@@ -0,0 +1,15 @@
+module.exports = {
+    apps: [
+      {
+        name: 'online-voting',
+        script: 'index.js',
+        instances: 'max',
+        exec_mode: 'cluster',
+        env: {
+          NODE_ENV: 'production',
+          PORT: process.env.PORT || 3000,
+        },
+      },
+    ],
+  };
+

package.json

@@ -5,6 +5,7 @@
   "main": "index.js",
   "scripts": {
     "start": "nodemon -e js,ejs",
+    "dev": "npx pm2 start ecosystem.config.js --env production",
     "start:prod": "node index.js",
     "pretest": "NODE_ENV=test npx sequelize-cli db:drop && NODE_ENV=test npx sequelize-cli db:create",
     "test": "NODE_ENV=test jest --detectOpenHandles",