Add frontend to be served by backend.

package.json

@@ -4,8 +4,9 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "start": "nodemon ./src/js/app.js localhost 3000",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "start": "npm-run-all --parallel start-frontend start-backend",
+    "start-backend": "nodemon ./backend/src/js/app.js localhost 3000",
+    "start-frontend": "webpack --watch --config frontend/webpack.config.js"
   },
   "keywords": [],
   "author": "",
@@ -20,6 +21,11 @@
   "devDependencies": {
     "eslint": "^7.4.0",
     "eslint-plugin-node": "^11.1.0",
-    "nodemon": "^2.0.4"
+    "nodemon": "^2.0.4",
+    "uglifyjs-webpack-plugin": "^2.2.0",
+    "webpack": "^4.41.2",
+    "webpack-cli": "^3.3.10",
+    "webpack-dev-server": "^3.9.0",
+    "npm-run-all": "^4.1.5"
   }
 }