Document interesting color resources

[dblock]

It could be interesting to document color resources in README, and give some philosophy around this project.

For example, http://www.thisiscolossal.com/2014/05/color-book/ is fascinating.

[dblock]

http://confreaks.com/videos/3242-kodio_2014-the-chroma-zone-engineering-color-on-the-web

[thisandagain]

Always 👍 on adding documentation and context to any project. 😄