Fix the `README.md` ( or the `package.json` ) of the `electron-app`; The explained script `build` is not defined in the `package.json`

[usagi]

In the current explaination of the README.md is:

npm install
# Start the app
npm start
# Compile the examples. Automatically runs after install
npm run build

But, build is not defined then it will be show:

npm ERR! missing script: build

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/usagi/.npm/_logs/2020-03-22T19_47_15_354Z-debug.log