README.md: Notes on where to start reading code
README.md: Notes on where to start reading code

Based on response from @whyrusleeping. (https://github.com/ipfs/go-ipfs/issues/4048#issuecomment-313774707)

License: MIT
Signed-off-by: Jon Choi <c7838a77406a39bc2fd5650d841398263052bb19@gmail.com>

Quantomicus/go-ipfs,MichaelMure/go-ipfs,chriscool/go-ipfs,OpenBazaar/go-ipfs,Luzifer/go-ipfs,kyledrake/go-ipfs,ianopolous/go-ipfs,Quantomicus/go-ipfs,OpenBazaar/go-ipfs,ianopolous/go-ipfs,kyledrake/go-ipfs,kyledrake/go-ipfs,WilliButz/go-ipfs,WilliButz/go-ipfs,Luzifer/go-ipfs,chriscool/go-ipfs,ianopolous/go-ipfs,MichaelMure/go-ipfs,Luzifer/go-ipfs,OpenBazaar/go-ipfs,Quantomicus/go-ipfs,MichaelMure/go-ipfs,WilliButz/go-ipfs,chriscool/go-ipfs