Merge pull request #35 from dugenkui03/patch-1

Add graphql-java-calculator

Author: bbakerman

README.md

@@ -40,6 +40,8 @@
 
 * [graphql-java-federation](https://github.com/rkudryashov/graphql-java-federation): A library to adapt graphql-java services to Apollo Federation specification
 
+* [graphql-java-calculator](https://github.com/dugenkui03/graphql-java-calculator): Based on directive, graphql-java-calculator provide graphql query with the ability of orchestration, field calculation and control flow.
+
 ### Code First
 * [graphql-java-annotations](https://github.com/graphql-java/graphql-java-annotations): Annotations-based syntax for GraphQL schema definition.