Specify Markdown version for Readme.md

[Stephen-Gates]

As discussed in the forum I think it would be useful to specify the version of Markdown recommended for the Readme.md file in a Data Package.

I think being explicit about the type of Markdown is good, enabling implementers of:

• tools to create data packages to only use "tags" that will be rendered correctly on supporting platforms.
• supporting platforms to have a simpler approach to rendering a defined set of Markdown

I'm leaning towards using CommonMark as a "stricter" implementation of the original Markdown

[Stephen-Gates]

Just noticed the link to commonmark.org in https://specs.frictionlessdata.io/data-package/#description (L311) so I'm assuming this is what is meant by "markdown" in the frictionless data specification.

[rufuspollock]

@Stephen-Gates yes - and FWIW I'd incline in processors to gfm style because i think that is useful and common. At the same time i'm not sure it is useful to allow people to specify their version of markdown as it won't help most tooling (they'll just parse as they can).

[Stephen-Gates]

Github Flavoured Markdown is based on CommonMark so it probably doesn't matter