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It's getting to painful to also maintain images. They can instead be generated on demand

Add a ConnectTo method to the network layer to create connections

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 implementation of graph sync messages including protobuf struct and
serialization/deserialization

fix #2 fix #3

Initial commit with skeleton readme and architecture diagrams to date