Apache MINA SSHD implements version 2 of the SSH protocol. Version 1 is obsolete and no longer considered secure, and almost nobody uses it anymore. The RFCs it links to in the README on GitHub all cover version 2 of the protocol.
Note that because the library supports a large number of cryptographic algorithms, many of which are no longer secure, you should be careful if you are using settings other than the defaults (which, except for the use of the ssh-rsa signature algorithm, should be secure).
If you’re looking for some basic setup documentation for a simple client, the README has a link to some documentation for that as well.
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