Create Redux Best Practices + design goals Document

Note, https://redux.js.org/style-guide/style-guide is essentially our best practices document. However it might serve to use this document as a starting point, reference it and encapsulate some examples from either product to show what it means. This document will help to guide engineers in creating new stores in Redux, as well as in modifying exisitng ones. For the goals portion of this document we should describe what some long term goals would be for the redux store, some of the design considerations and how they will work together with things like MetaMask Core, The controllers repo, etc. This document will be ratified by members of both @MetaMask/extension-devs and @MetaMask/mobile-devs and will be continuously updated as our needs change.

https://redux.js.org/style-guide/style-guide の Redux style guide から始め、contributor-docs リポジトリの構成を確認して、ドキュメントの最適な配置場所を見つけます。extension と mobile の製品から例を集め、新規および既存の Stores に関するガイダンス、長期的な Redux の設計目標、MetaMask Core および controllers リポジトリとの関係をまとめます。両方の engineering グループによる承認に向けてドキュメントの準備が整えば完了です。

索引モデルが issue の本文から書いたものです。