Added js libraries

Author: delvedor

README.md

@@ -10,4 +10,6 @@ ECS Logging - Common resources and issues for the language specific ECS loggers
   * [Monolog v2.x](https://github.com/elastic/ecs-logging-php/blob/master/docs/Monolog_v2.md)
 * [.NET](https://github.com/elastic/ecs-dotnet)
   * [Serilog](https://github.com/elastic/ecs-dotnet/tree/master/src/Elastic.CommonSchema.Serilog)
-  
+* [JavaScript](https://github.com/elastic/ecs-logging-js)
+  * [Winston](https://github.com/elastic/ecs-logging-js/tree/master/loggers/winston)
+  * [Morgan](https://github.com/elastic/ecs-logging-js/tree/master/loggers/morgan)