The SDC Docker User Guide provides the information on how to connect to the Docker Remote API, its methods, and features.
The SDC Docker implementation does have some differences from Docker Inc.'s implementation. Note the divergence before you start using SDC Docker.
Get started with contributing to this open source project by reading about the installation and administration of SDC Docker from the repo README.
If you are new to Docker, you may want to read the Docker User Guide to understand some of the basic concepts first.