Add live GraphQL data via Apollo bindings to components [WIP]

[PWAStudioBot]

From @ericerway on May 11, 2018 18:52

As a developer, I'd like to be able to specify my GraphQL queries on a per-component basis, so I do not need to think about orchestrating data fetching needs at an application level.

Acceptance Criteria:

• The venia-pwa-concept theme is setup with react-apollo's provider that allows components in the tree to specify queries to be fetched, based on suggesting implementation path in the react-apollo docs
• At least one component in the theme fetches live data through GraphQL, using Apollo Client's React bindings
• Basic documentation is provided specifying how to attach a query to a React component

Copied from original issue: magento-research/venia-pwa-concept#69