Add build script to package.json

Added build script to package.json.

Author: sameer123us

package.json

@@ -7,6 +7,11 @@
     "start": "node app.js",
     "test": "jest --watch"
   },
+  "scripts": {
+  "start": "node app.js",
+  "test": "jest --ci --forceExit --coverage",
+  "build": "echo 'No build step required for plain Node.js'"
+  },
   "author": "Adem Cemil YALCIN",
   "license": "ISC",
   "dependencies": {