added dev, build and start script

Author: Developerayo

package.json

@@ -5,6 +5,9 @@
     "react-dom": "^16.9.0"
   },
   "scripts": {
+    "dev": "next",
+    "build": "next build",
+    "start": "next start",
     "now-build": "npx next"
   }
 }