message: chore(demo): update README
diff: -# Test for vuepress-plugin-theme
  +# vuepress-plugin-theme Demo
  This is a demo and test for vuepress-theme-hope.
  +
  +You can use this demo directly via:
  +
  +```bash
  +npm init vuepress-theme-hope@next [dir]
  +```
  +
  +where `[dir]` is the folder you want to put the demo in.
  