Detail lint scripts

[tvharris]

This may be beyond the scope of this repo, but the readme could instruct the user how to set up a lint script. For example, Rooster has these lines in package.json:

"precommit": [
    "lint"
  ],
  "scripts": {
    "lint": "eslint .",

It also may be worth autofixing whatever can be autofixed:
"lint:fix": "npm run lint -- --fix"