Added GraphQL entity definitions to related projects.

Fixes #700

Author: pmelab

README.md

@@ -66,3 +66,5 @@ as well as other other contributed modules supporting it:
   > Allows you to inject data into Twig templates by simply adding a GraphQL query.
 * GraphQL Views [https://github.com/drupal-graphql/graphql-views](https://github.com/drupal-graphql/graphql-views)
   > Adds support for views to GraphQL.
+* GraphQL Entity Definitions [https://www.drupal.org/project/graphql_entity_definitions](https://www.drupal.org/project/graphql_entity_definitions)
+  > Adds structural entity information to GraphQL.