Add Links to Awesome Lists & Other Similar Projects

[tajmone]

Hi @mashk,

Nice work here; I'm linking to it in my own markdown project:

https://github.com/tajmone/markdown-guide#awesome-markdown

I've noticed that you have a Resources section at the end which could provide links to other Awesome Markdown lists and similar projects. If we all link to each other's projects, creating a web of references, we make it easier on users to find markdown resources.