Link to blog article from readme

The article serves as a more in-depth look at how we use it, and could
be useful for people already reading the readme.

Change-Id: I373c24e49cbf09715205e4dcbae6935ea831c53f
Reviewed-on: https://gerrit.causes.com/23029
Tested-by: Aiden Scandella <aiden@causes.com>
Reviewed-by: Joe Lencioni <joe.lencioni@causes.com>