Update README.md

Author: donbeave

README.md

@@ -7,6 +7,7 @@
 ## Examples
 
 * [todomvc-relay-java](https://github.com/graphql-java/todomvc-relay-java): Port of the Relay TodoMVC example to a java backend
+* [graphql-datetime-sample-app](https://github.com/donbeave/graphql-java-datetime/tree/master/graphql-datetime-sample-app): GraphQL example app with usage of date and time scalars
 
 ## Schema Libraries
 
@@ -47,6 +48,10 @@
 
 * [Light Java GraphQL](https://github.com/networknt/light-java-graphql): A lightweight, fast microservices framework with all other cross-cutting concerns addressed that is ready to plug in GraphQL schema. 
 
+## Scalars
+
+* [graphql-java-datetime](https://github.com/donbeave/graphql-java-datetime): A set of ISO 33601, RFC 3339 compatible date time scalars for GraphQL Java
+
 ## License
 
 [![CC0](https://i.creativecommons.org/p/zero/1.0/88x31.png)](https://creativecommons.org/publicdomain/zero/1.0/)