Add utility targets.

package.json

@@ -21,5 +21,9 @@
     "style-loader": "^0.23.1",
     "webpack": "^4.29.6",
     "webpack-cli": "^3.2.3"
+  },
+  "scripts": {
+	"watch": "webpack --mode=development --watch",
+	"serve": "php -S 127.0.0.1:8000 -t public"
   }
 }