Your contribution cannot be approved because it does not refer to or relate to an open-source repository. See here for a definition of "open-source."

Explanation:

• Markdown Plus, as a product application, is NOT free to use, and can be bought here ($14.99 on Mac Appstore);
• the GitHub repo does however mention an MIT license, but also a copyright notice.
• regarding the MIT license: "The MIT license permits reuse within proprietary software provided that all copies of the licensed software include a copy of the MIT License terms and the copyright notice." => this means that it is possible to fork the GitHub repo, and embed (parts of) the Markdown Plus code inside other code, and release that as a free open source product, but Markdown Plus as a "bundled product" definitely is not free to use;
• I'm not quite sure, but I'm suspecting that the repo owner doesn't quite understand the true legal nature of an MIT license;
• your tutorial wouldn't qualify to my Utopian standards / rule interpretation, for your tutorial only describes adding a JSON config file, which only regards charts.js, and you don't explain all its components in a step-by-step fashion.
• your other Markdown Plus tutorials shouldn't have been accepted either: I will notify the other Utopian mods about it.
  @scipio

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