Add example to readme fix #9

Author: oliemansm

README.md

@@ -15,13 +15,13 @@ When using Maven:
 <dependency>
   <groupId>com.graphql-java-kickstart</groupId>
   <artifactId>graphql-webclient-spring-boot-starter</artifactId>
-  <version>0.2.0</version>
+  <version>0.3.0</version>
 </dependency>
 ```
 
 When using gradle:
 ```groovy
-implementation "com.graphql-java-kickstart:graphql-webclient-spring-boot-starter:0.2.0"
+implementation "com.graphql-java-kickstart:graphql-webclient-spring-boot-starter:0.3.0"
 ```
 
 Configure at least the URL of the GraphQL API to consume:
@@ -31,6 +31,27 @@ graphql:
     url: https://graphql.github.com/graphql
 ```
 
+The starter creates a Spring bean of type `GraphQLWebClient` that you can use in your
+classes to send queries. A simplified example might look like this:
+
+```java
+@Component
+class MyClass {
+  
+  private final GraphQLWebClient graphQLWebClient;
+  
+  MyClass(GraphQLWebClient graphQLWebClient) {
+    this.graphQLWebClient = graphQLWebClient;
+  }
+  
+  void executeSomeQuery() {
+    GraphQLRequest request = GraphQLRequest.builder().query("query { hello }").build();
+    GraphQLResponse response = graphQLWebClient.post(request).block();
+    String value = response.get("hello", String.class);
+  }
+}
+```
+
 ### Using latest Snapshots
 
 You can use the latest Snapshots by configuring the Snapshot repository, see https://www.graphql-java-kickstart.com/servlet/#using-the-latest-development-build.