Code

Get a GitHub account.
Fork DaisyDiff repository.
DaisyDiff uses Continuous Integration (CI). That runs unit tests automatically on every commit. Next to each successful run you see a green tick at DaisyDiff commits. That links to an automatic report of running unit tests.
Set up CI for your repository: github.com/your-name/your-fork-name > Settings > Integrations & services > Add service > Travis CI. DaisyDiff also works with Jenkins: https://qa.nuxeo.org/jenkins/job/Vendor/job/daisydiff/ and https://github.com/nuxeo/nuxeo-diff. If you make it work with other CI service, please update this.
Commit to your fork. Create pull requests.

Documentation

Fork DaisyDiff.github.io repository. Follow DocumentationStandard but replace ‘selite’ with ‘daisydiff’. Commit to your fork. Create pull requests.