Thank you for your intention to contribute!
If you want to provide feedback, make a suggestion, or report a bug, create an issue on GitHub.
If you want to experiment with the code and maybe even send a pull request,
use npm install and npm test. The code should be test-driven.
npm run coverage will show you your code coverage.
Before you start doing really big changes, it is advisable to open an issue to discuss it up front in case to avoid doing work that I will be hesitant to merge in for whatever reason.