Update a README.md

Author: upgle

README.md

@@ -23,6 +23,7 @@
 
 ## Changelogs
 - [Java 8 CHANGELOG.md](core/java8/CHANGELOG.md)
+- [Java 11 CHANGELOG.md](core/java8/CHANGELOG.md)
 
 
 ## Quick Java Action
@@ -94,17 +95,33 @@ wsk action invoke --result helloJava --param name World
 ```
 
 ## Local development
+
+For Java 8
 ```
 ./gradlew core:java8:distDocker
 ```
 This will produce the image `whisk/java8action`
 
-Build and Push image
+For Java 11
+```
+./gradlew core:java11:distDocker
+```
+This will produce the image `whisk/java11action`
+
+Build and Push image for Java 8
 ```
 docker login
 ./gradlew core:java8:distDocker -PdockerImagePrefix=$prefix-user -PdockerRegistry=docker.io
 ```
 
+Build and Push image for Java 11
+```
+docker login
+./gradlew core:java11:distDocker -PdockerImagePrefix=$prefix-user -PdockerRegistry=docker.io
+```
+
+The `$user_prefix` is usually your dockerhub user id.
+
 Deploy OpenWhisk using ansible environment that contains the kind `java:8`
 Assuming you have OpenWhisk already deploy localy and `OPENWHISK_HOME` pointing to root directory of OpenWhisk core repository.