Add Little's Law

[tobiasbueschel]

https://www.scrum.org/resources/littles-law-professional-scrum-kanban

"The fundamental result of Little’s Law is that for a given process, in general, the more things that you work on at any given time (on average) the longer it is going to take for each of those things to finish (on average)" Source: https://scrumorg-website-prod.s3.amazonaws.com/drupal/2018-05/Little%E2%80%99s%20Law%20for%20Professional%20Scrum%20with%20Kanban.pdf