Normal queries should use data field

[popstr]

Hey Oded!
You have provided a really nice and useful example. Thank you for that!

However, I think you have an error in the RepositorySchema class. When doing a normal query (not introspection), we need to return the data under the a field called "data", just like we do in the Introspection case. See response examples at https://graphql.org/learn/queries/

This is the line that outputs the data without the data field:

graphql-java-spring-example/src/main/java/graphql/RepositorySchema.java

Line 32 in 5dcf533

returnData = graphQL.execute(queryString,query).getData();

I'll make you a PR unless you have a different opinion on the issue.

[popstr]

See PR here: #3