Added Nodes JVM client (graphql#524)

Added Nodes JVM GraphQL client.

Author: liqweed

site/code/index.html.js

@@ -411,6 +411,8 @@ Executor.execute(schema, query) map println
 
   - [Apollo Android](https://github.com/apollographql/apollo-android): A strongly-typed, caching GraphQL client for Android, written in Java.
 
+  - [Nodes](https://github.com/americanexpress/nodes): A GraphQL JVM Client designed for constructing queries from standard model definitions. By American Express.
+
 ### JavaScript
 
   - [Relay](https://facebook.github.io/relay/) ([github](https://github.com/facebook/relay)) ([npm](https://www.npmjs.com/package/react-relay)): Facebook's framework for building React applications that talk to a GraphQL backend.