PAPI-4: Added npm script for building the application

package.json

@@ -5,6 +5,7 @@
   "main": "index.js",
   "scripts": {
     "start": "tsc && node ./dist/app.js",
+    "build": "tsc",
     "debug": "export DEBUG=* && npm run start",
     "test": "echo \"Error: no test specified\" && exit 1"
   },