Publish a developer guide to the GraphQL API:

• installation
• accessing it, including GraphiQL client
• general presentation of how to use GraphQL (links to react doc, etc)
• principle in eZ Platform (content type groups, content types and fields definitions are used to generate the schema)
• authentication (for now, session only)
• how to find content (filtering, sorting)
• customization (custom field types, custom domain objects)

The GraphCMS API doc can be used as an inspiration for the structure and elements to document.