added top level readme

Author: bbakerman

readme.md

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+
+# graphql-java-examples
+
+The following are a series of examples of graphql-java in action.  They are intended as inspiration on how you could use
+graphql-java in your next project.
+
+## http example
+
+The http example is a simple Spring Boot application that serves the classic StarWars schema.
+
+## defer example
+
+The defer example is a simple Spring Boot application that demonstrates more advanced graphql 
+performance by allowing a client to split the result into the data it needs immediately followed
+by the data it can `defer` to later.