Update README.md (#3089)
Update README.md (#3089)

Adding text about client libraries support in Cloud Tools for Eclipse and Cloud Tools for IntelliJ.
vam-google/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java