Resolve "Architecture Document"

Closes #71 (closed)

Idea: https://matklad.github.io//2021/02/06/ARCHITECTURE.md.html

Example: https://github.com/rust-analyzer/rust-analyzer/blob/d7c99931d05e3723d878bea5dc26766791fa4e69/docs/dev/architecture.md

More prosaic example: https://caddyserver.com/docs/architecture

changed milestone to %v0.1.0 Codename Threadbare

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• 1b9ff377 - draft architecture.md

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requested review from @istmabauc and @m.stiemerling

requested review from @fbi1478

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• f0ca963a - Update ARCHITECTURE.md

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Not sure what this sentence is saying to me: "So avoid too much divergence from the changing code this document does focus on high-level concepts instead of implementation details."

Even more questions: nucleus models vs yang models. I will the differentiation, if nucleus models are the compile yang models or tapi-reference stuff with swagger and yang models are the yang models.

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• 514c017c - Some word smithing

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• 4187c7fd - Tried a clarification about SBI and nucleus dependencies.

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Even, even more questions: "Only SBIs defined by a YANG model will be supported by goSDN" ..."at this point of time"?

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• 3d053530 - Update ARCHITECTURE.md

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Even, even, even more questions: "Transport layer" for gnmi etc makes @m.stiemerling nervous, as transport layer is layer 4 in OSI or the photonic in DWDM networks. Not sure what a better, distinct name would be. Probably, "transport implementation layer" though it is bit long.

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• 4eed3b0f - Update ARCHITECTURE.md

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• c92db51e - 1 commit from branch 67-overhaul-architecture

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changed target branch from 67-overhaul-architecture to develop