Create better documentation for bitswap + webpage for it

[jcalfee]

Congratulations on having the top result at duckduckgo.com query: bitswap protocol .. Can you add a link to the main page to help users find more high level docs on the topic? tq

[jbenet]

@jcalfee thanks-- we need a dedicated website and repo for the bitswap protocol. these do not exist yet.

right now (the sorry state of affairs is that) the best links are:

• https://ipfs.io/ipfs/QmR7GSQM93Cx5eAg6a6yRzNde1FQv7uL6X1o4k7zrJa3LX/ipfs.draft3.pdf
• https://github.com/ipfs/go-ipfs/tree/master/exchange/bitswap

[jbenet]

We need to:

• fill https://github.com/ipfs/specs/tree/master/bitswap (@jbenet @dignifiedquire @whyrusleeping)
• maybe create ipfs/bitswap repo to link to the spec and implementations in other langs. ?
• break go-bitswap out of go-ipfs (@whyrusleeping, @Kubuxu)