add local prettier config code example

Example 1: how to edit /.prettierrc.json file pretter

{
    "trailingComma": "none",
    "tabWidth": 4,
    "semi": true,
    "singleQuote": true
}

Example 2: prettierrc

{
  "trailingComma": "es5",
  "tabWidth": 4,
  "semi": false,
  "singleQuote": true
}