Maintainers - confirm names and list in README.md

[finnlewis]

From discussions in the Technical Group, we want to identify named maintainers for each project and list these in the README, in line with projects on Drupal.org.

We have a spreadsheet of all projects as an overview of named maintainers against projects:

https://docs.google.com/spreadsheets/d/1t4xUw6DdLQxrr3RrtKcqBOAV0E8G8oceHGcbO9vQBYA/edit#gid=0

This issue is to confirm named maintainers for this project and list in the README.md and spreadsheet.

We would like maintainers for each project to take a lead on:

• responding to issues
• making releases
• reviewing pull requests