Add more information about usage and setup.

[ericwooley]

Does this support webrtc? (maybe some package replacement shinanigans?)

This seems like an awesome library, but I am not sure how to get started using it, and what environments I can use it in.

[substack]

This only works with udp/tcp bittorrent since there is no dht and thus no bep44 support in webtorrent yet: https://github.com/feross/webtorrent/issues/288

[ChrisChiasson]

It seems like you added bep44 support to webtorrent/bittorrent-dht