Include links to other tutorials/papers/resources

[awwright]

• http://spacetelescope.github.io/understanding-json-schema/index.html
• http://cswr.github.io/JsonSchema/spec/introduction/
• http://www2016.net/proceedings/proceedings/p263.pdf

[benjagm]

It would be great to create a youtube list in our channel putting together video resources.

[benjagm]

Added to the docs strategy #158

[benjagm]

Closed in favour of #282