message: docs: add cdn tips
diff: @@ -56,12 +56,21 @@ The easiest way to use Vant is to include a CDN link in the html file, after whi
  </script>
  ```
  +#### Free CDN
  +
  You can use Vant through these free CDN services:
  - [jsdelivr](https://www.jsdelivr.com/package/npm/vant)
  - [cdnjs](https://cdnjs.com/libraries/vant)
  - [unpkg](https://unpkg.com/)
  +Note: Free CDN is generally used for making prototypes or personal projects. It is not recommended to use free CDN in production environment.
  +
  +For enterprise developers, we recommend:
  +
  +- install with npm, use build tools to bundle it
  +- download the scripts, host it on your own server
  +
  ### CLI
  We recommend to use [Vue Cli](https://cli.vuejs.org/) to create a new project.
  