docs: update README with CI status table (#7)

README.md

@@ -2,8 +2,8 @@
 
 Java idiomatic client for [Cloud Build][api-reference].
 
-[![Kokoro CI][kokoro-badge-image]][kokoro-badge-link]
 [![Maven][maven-version-image]][maven-version-link]
+![Stability][stability-image]
 
 - [Product Documentation][product-docs]
 - [Client Library Documentation][javadocs]
@@ -91,19 +91,37 @@ information.
 
 Apache 2.0 - See [LICENSE][license] for more information.
 
+## CI Status
+
+Java Version | Status
+------------ | ------
+Java 7 | [![Kokoro CI][kokoro-badge-image-1]][kokoro-badge-link-1]
+Java 8 | [![Kokoro CI][kokoro-badge-image-2]][kokoro-badge-link-2]
+Java 8 OSX | [![Kokoro CI][kokoro-badge-image-3]][kokoro-badge-link-3]
+Java 8 Windows | [![Kokoro CI][kokoro-badge-image-4]][kokoro-badge-link-4]
+Java 11 | [![Kokoro CI][kokoro-badge-image-5]][kokoro-badge-link-5]
+
 [api-reference]: https://cloud.google.com/cloud-build/docs/api
 [product-docs]: https://cloud.google.com/cloud-build/
 [javadocs]: https://googleapis.dev/java/google-cloud-cloudbuild/latest
-[kokoro-badge-image]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-cloudbuild/master.svg
-[kokoro-badge-link]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-cloudbuild/master.html
+[kokoro-badge-image-1]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-cloudbuild/java7.svg
+[kokoro-badge-link-1]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-cloudbuild/java7.html
+[kokoro-badge-image-2]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-cloudbuild/java8.svg
+[kokoro-badge-link-2]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-cloudbuild/java8.html
+[kokoro-badge-image-3]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-cloudbuild/java8-osx.svg
+[kokoro-badge-link-3]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-cloudbuild/java8-osx.html
+[kokoro-badge-image-4]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-cloudbuild/java8-win.svg
+[kokoro-badge-link-4]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-cloudbuild/java8-win.html
+[kokoro-badge-image-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-cloudbuild/java11.svg
+[kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-cloudbuild/java11.html
 [maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/cloudbuild.svg
+[stability-image]: https://img.shields.io/badge/stability-alpha-orange
 [maven-version-link]: https://search.maven.org/search?q=g:com.google.cloud%20AND%20a:cloudbuild&core=gav
 [authentication]: https://github.com/googleapis/google-cloud-java#authentication
 [developer-console]: https://console.developers.google.com/
 [create-project]: https://cloud.google.com/resource-manager/docs/creating-managing-projects
 [cloud-sdk]: https://cloud.google.com/sdk/
 [troubleshooting]: https://github.com/googleapis/google-cloud-common/blob/master/troubleshooting/readme.md#troubleshooting
-
 [contributing]: https://github.com/googleapis/java-cloudbuild/blob/master/CONTRIBUTING.md
 [code-of-conduct]: https://github.com/googleapis/java-cloudbuild/blob/master/CODE_OF_CONDUCT.md#contributor-code-of-conduct
-[license]: https://github.com/googleapis/java-cloudbuild/blob/master/LICENSE
+[license]: https://github.com/googleapis/java-cloudbuild/blob/master/LICENSE