docs: highlight package registry publication in README

Author: jradcliff

README.md

@@ -1,35 +1,22 @@
 # Data Manager API utility library and samples for Java
 
+[![Maven Central](https://img.shields.io/maven-central/v/com.google.api-ads/data-manager-util.svg)](https://central.sonatype.com/artifact/com.google.api-ads/data-manager-util)
+
 Utility library and code samples for working with the
 [Data Manager API](https://developers.google.com/data-manager/api) and Java.
 
 ## Setup instructions
 
-https://developers.google.com/data-manager/api/get-started/set-up-access#java
-
-## Add dependencies to your project
-
-To use the utility library in your Java project, add the following dependency:
-
-### Gradle
+The `com.google.api-ads:data-manager-util` utility library is published to
+[Maven Central](https://central.sonatype.com/artifact/com.google.api-ads/data-manager-util).
 
-```groovy
-implementation 'com.google.api-ads:data-manager-util:0.4.0'
-```
-
-### Maven
-
-```xml
-<dependency>
-  <groupId>com.google.api-ads</groupId>
-  <artifactId>data-manager-util</artifactId>
-  <version>0.4.0</version>
-</dependency>
-```
+To use the utility library in your Java project, follow the instructions in the
+[installation guide](https://developers.google.com/data-manager/api/devguides/quickstart/install-library#java).
 
 ## Repository structure
 
-- [`data-manager-util`](data-manager-util): Source code for the utility library.
+- [`data-manager-util`](data-manager-util): Source code for the
+  `com.google.api-ads:data-manager-util` utility library.
 
   Follow the setup instructions to declare a dependency on the current version
   of `com.google.api-ads:data-manager-util` in your project. Use the utilities