For getting started and general documentation, please browse, and feel free to contribute to the project wiki.
For support questions ("How do I", "I can't seem to", etc.) please search and if not already answered, open a thread in the Support Forums.
For technical issues (e.g., to submit a bug or feature request) please search and if not already filed, open an issue on GitHub.
If you're looking to get involved with the project, at any level of expertise, that's gotten easier too. WP Document Revisions is an open source project and is supported by the efforts of an entire community. We'd love for you to get involved. Whatever your level of skill or however much time you can give, your contribution is greatly appreciated.