GitHub Flavored Markdown (GFM) page?

[mrienstra]

Thoughts on adding a "Tools" entry for GitHub Flavored Markdown (GFM)?

It's already mentioned in several places:
https://github.com/mattcone/markdown-guide/search?q=github+flavored

... But seems worthy of its own page to me!

Also, very very minor nitpick, but there is some slight inconsistency with how GFM is mentioned at the moment:

"(GFM)" suffix, external link:

• _extended-syntax/availability.md
• _tools/typora.md

"(GFM)" suffix, no external link:

• _tools/simpleen.md

No "(GFM)" suffix, no external link:

• _tools/madoko.md
• _tools/zettlr.md