Pristinize the repo

**Describe the feature you would like**
This repo should be using pristine to get a license, better baseline documentation, and encourage contributions.

**Describe the solution**
https://github.com/etclabscore/pristine#how-to-use-pristine-in-your-project

Read the linked Pristine guide first, then inspect the repository's current license, baseline documentation, and contribution guidance. Done means Pristine is adopted for this repository and the requested license, documentation baseline, and contribution encouragement are in place.

Written by the indexing model from the issue text.