Arch recommendations for Brave Sync Improvements

[hspencer77]

Contains architecture recommendations for Brave Sync.

Associated task: https://github.com/brave/devops/projects/13#card-16355778

[diracdeltas]

thanks @hspencer77!

1. please exclude architecture/.DS_Store
2. would this work as a wiki document instead? that would make it easier to edit/update. https://github.com/brave/sync/wiki

[hspencer77]

@diracdeltas sorry for the delay in my response. Yes, I can move it to the wiki. The diagrams would still need a place to live (can be under the architecture folder), but everything else can be put in the wiki.