Client state, reducers, and actions topic

[jcalcaben]

This issue is a:

[ ] Bug [X] New Topic Request [ ] Topic Clarification Request [ ] New Feature Request [ ] Other

Description:

Content needed for Client state, reducers, and actions topic.

src/technologies/basic-concepts/client-state-reducers-actions/index.md

Expected Result:

Client state, reducers, and actions content exists and covers the following:

• [ ] Brief overview of Redux
• [ ] What is a client state
• [ ] What is a reducer
• [ ] What is an action
• [ ] How these parts fit together in a PWA
• [ ] Sample code provided for each part

Additional Information:

• https://redux.js.org/introduction/core-concepts
• https://redux.js.org/introduction/three-principles
• https://medium.com/javascript-scene/10-tips-for-better-redux-architecture-69250425af44

[PWAStudioBot]

This issue was moved to magento-research/pwa-studio#47