package.json: enable npm run build command

README.md

@@ -6,7 +6,7 @@ To build, after cloning this repository:
 
 ```
 npm install
-npm run webpack
+npm run build
 ```
 
 

package.json

 {
   "name": "monaco-editor-erp5",
+  "scripts": {
+    "build": "webpack --config webpack.config.js"
+  },
   "dependencies": {},
   "devDependencies": {
     "css-loader": "^0.28.11",