(docs) Add GraphQL Java Kickstart / GraphQL Spring Boot to java-server

Author: setchy

src/content/code/language-support/java-kotlin-android/server/graphql-java-kickstart.md

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+---
+name: GraphQL Spring Boot
+description: GraphQL Spring Boot from GraphQL Java Kickstart
+url: https://www.graphql-java-kickstart.com/
+github: graphql-java-kickstart/graphql-spring-boot
+---
+
+The GraphQL Spring Boot turns any Spring Boot application into a GraphQL Server 
+
+
+Started includes features such as:
+
+* Use a schema-driven API with the help of [GraphQL Java Tools](https://github.com/graphql-java-kickstart/graphql-java-tools)
+* Optionally choose to use an annotation driven schema with the help of [GraphQL-Java Annotations](https://github.com/Enigmatis/graphql-java-annotations)
+* Embedded [GraphiQL](https://github.com/graphql/graphiql) tool for schema introspection and query debugging
+* Embedded [GraphQL Playground](https://github.com/prisma/graphql-playground) tool for schema introspection and query debugging
+* Embedded the [GraphQL Voyager](https://github.com/APIs-guru/graphql-voyager) tool to represent your GraphQL API as an interactive graph
+
+
+See [GraphQL Java Kickstart Getting Started](https://www.graphql-java-kickstart.com/spring-boot/getting-started/) for how to get started.