examples README.md (#349)

examples/README.md

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+# Examples
+
+Example apps that use `graphql-kotlin` libraries to test and demonstrate usages.
+
+* [spring](https://github.com/ExpediaGroup/graphql-kotlin/tree/master/examples/spring) - This is a sample Spring Boot app that uses `graphql-kotlin-spring-server` to create reactive GraphQL web application. Please refer to the README file for details on how to run the target application.
+* [federation](https://github.com/ExpediaGroup/graphql-kotlin/tree/master/examples/federation) - Example Spring Boot apps generating Federated GraphQL schema and Apollo Gateway that exposes single federated schema are provided in examples/federation project. Please refer to their README files for details on how to run the target applications.