Add design note for standalone Node-RED#30

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kazuhitoyokoi wants to merge 5 commits intonode-red:masterfrom

kazuhitoyokoi:master-standalonenodered

Commits on May 19, 2020

Add design note for standalone Node-RED
kazuhitoyokoi
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Commits on May 20, 2020

Update documentation based on Dave-san's comments
kazuhitoyokoi
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Commits on May 28, 2020

Add scope of standalone Node-RED
kazuhitoyokoi
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Commits on Nov 30, 2021