chore: configure release-please github action

PiperOrigin-RevId: 869687403

Author: tilgalas

.github/workflows/release-please.yaml

@@ -0,0 +1,17 @@
+'on':
+  push:
+    branches:
+      - main
+  workflow_dispatch: {}
+permissions:
+  contents: write
+  issues: write
+  pull-requests: write
+name: release-please
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

README.md

@@ -44,7 +44,7 @@ debugging, versioning, and deployment anywhere – from your laptop to the cloud
 
 If you're using Maven, add the following to your dependencies:
 
-<!-- {x-version-start:google-adk:released} -->
+<!-- x-release-please-released-start-version -->
 
 ```xml
 <dependency>
@@ -60,7 +60,7 @@ If you're using Maven, add the following to your dependencies:
 </dependency>
 ```
 
-<!-- {x-version-end} -->
+<!-- x-release-please-released-end -->
 
 To instead use an unreleased version, you could use <https://jitpack.io/#google/adk-java/>;
 see <https://github.com/enola-dev/LearningADK#jitpack> for an example illustrating this.

core/src/main/java/com/google/adk/Version.java

@@ -22,7 +22,7 @@
  */
 public final class Version {
   // Don't touch this, release-please should keep it up to date.
-  public static final String JAVA_ADK_VERSION = "0.5.0";
+  public static final String JAVA_ADK_VERSION = "0.5.0"; // x-release-please-released-version
 
   private Version() {}
 }