add quick-start docs
add quick-start docs

yciabaud/webtorrent,joshterrill/webtorrent,joshterrill/webtorrent,jamesliu96/webtorrent,feross/webtorrent,webtorrent/webtorrent,yciabaud/webtorrent,jamesliu96/webtorrent,feross/webtorrent,webtorrent/webtorrent,arestov/webtorrent