If you want to see dqlite in action, please check out the demo program that comes with the Go dqlite bindings. For details about dqlite’s internals see the architecture notes, the consistency model description and the replication mechanics. Alternatively, you can watch the talk about dqlite that was given at FOSDEM 2020.
If you’re writing a dqlite client for a new language, please refer to the wire protocol description.
If you have questions about dqlite, please have a look at the FAQ before filing issues.