Code style automation

[Fan Qiuxia]

Hi everyone,

I add a git hook for code style automation in skywalking-rocketbot-ui with 
prettier configs.
There are configs.
{
  "trailingComma": "all",
  "printWidth": 120,
  "tabWidth": 2,
  "semi": true,
  "singleQuote": true,
  "bracketSpacing": true,
  "vueIndentScriptAndStyle": true,
  "arrowParens": "always"
}

If you have any questions, please feel free to ping me or pull requests.