Add theme concise

[yingyu5658]

After you have read the instructions for adding a theme, please make sure:

• your theme.toml is complete
  • name
  • license
  • licenselink
  • description
  • homepage
  • demosite (if one exists)
  • tags
  • features
  • authors/author (depending on whether the theme has multiple or a single author)
  • original (if the theme is a fork)
• you're using absolute paths for images in your README
• you've got appropriate thumbnail and screenshot images
• your theme comes with an appropriate license

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[bep]

Thanks for this. This looks good, only one small thing: The licence field in theme.toml is meant to be a string identifier (e.g. "MIT") and not a link.