Update README.md
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 This repository includes related files of following docker images:
  - OAP server
  - UI
+ - Java agent
  
  Documents of each version are in `v-x.y.z/oap` and `v-x.y.z/ui`. Such as [8.1.0 OAP](8/8.1.0/oap) and [8.1.0 UI](8/8.1.0/ui)
 
@@ -17,6 +18,9 @@
 - https://hub.docker.com/r/apache/skywalking-ui
 - https://hub.docker.com/r/apache/skywalking-oap-server
 
+Java agent images are available too.
+- https://hub.docker.com/repository/docker/apache/skywalking-java-agent
+
 # How to build
 
 When the version < `8.4.0`, the release manifests are grouping by their major version number and full version number in `archive`.