Add docs for wrapper-validation action

README.md

@@ -69,3 +69,26 @@ jobs:
 ```
 
 See the [full action documentation](docs/dependency-submission.md) for more advanced usage scenarios.
+
+## The `wrapper-validation` action
+
+The `wrapper-validation` action validates the checksums of _all_ [Gradle Wrapper](https://docs.gradle.org/current/userguide/gradle_wrapper.html) JAR files present in the repository and fails if any unknown Gradle Wrapper JAR files are found.
+
+The action should be run in the root of the repository, as it will recursively search for any files named `gradle-wrapper.jar`.
+
+### Example workflow
+
+```yaml
+name: "Validate Gradle Wrapper"
+on: [push, pull_request]
+
+jobs:
+  validation:
+    name: "Validation"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: gradle/actions/wrapper-validation@v3
+```
+
+See the [full action documentation](docs/wrapper-validation.md) for more advanced usage scenarios.