Add docs for AIT presence

[owenpearson]

AIT-877

Adds docs for using presence in the AIT SDK, as implemented in ably/ably-ai-transport-js#151. See also the in-repo docs PR: ably/ably-ai-transport-js#183

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[ttypic]

LGTM, but reading the docs make me think maybe it's worth to have usePresence hook in AIT sdk, that will automatically get channel name from the session, similar to other client session hooks?