Update README

Author: rstoyanchev

README.md

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-# spring-graphql-examples
+
+# Overview
+
+Repository with [Spring for GraphQL](https://github.com/spring-projects/spring-graphql) examples.
+
+# Examples
+
+- [websocket-authentication](websocket-authentication)
+
+# Spring.io Getting Started Guides
+
+The following guides illustrate how to use some features concretely:
+
+* [Building a GraphQL service](https://spring.io/guides/gs/graphql-server/)
+* [Building a Reactive RESTful Web Service](https://spring.io/guides/gs/reactive-rest-service/)