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setup GraphSyncNetwork interfaces and provide an implementation based on libp2p.host

fix #1

correction to diagram, protobuff, and remove test function not needed

Add ToNet and FromNet functions that read/write to an io stream for use in network. Also type
response codes

Use a Cid as a root instead of a node, so that only one round trip is neccesary

Initial commit with skeleton readme and architecture diagrams to date