Add link to Dart pub

[wardpenney]

Hi! Thanks for making this.

I had trouble finding the right Dart package for this because the GitHub repository name is different. Could we remedy that?

A couple suggestions:

• Add a link to the Dark package into the repo description
• Add a link in the README
• Add a portion of the readme that has a pubspec.yaml line on how to import.

Not a big issue, but a little cognitive friction for the consumer.

[wardpenney]

Edit: Ok I was wrong. The GitHub package is the same name, but other packages are taking the SEO from google pretty bad. I was confusing it with redux_dart_tools and others.

I think a link somewhere would help a bit. LMKWYT