Update readme to include agents sdk example

[1egoman]

There's not a ton I added here, but I think this at least starts to point users in the direction of agents in the readme versus what was there previously.

Merging blocked on https://github.com/livekit/components-js/pull/1207 and broader docs updates (link placeholders need to be replaced with the eventual docs link urls)

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Latest commit: ebeb42bc3c27b12d61a21b819254cfe6171b4538

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size-limit report 📦

Path	Size
LiveKitRoom only	6 KB (0%)
LiveKitRoom with VideoConference	32.46 KB (0%)
All exports	43.29 KB (0%)