Update README with details about testcontainer setup

README.md

@@ -28,4 +28,4 @@ repository saves this entity to the DB?
 Most interesting things can be found in the [MicronautDataIdExampleTest.kt](https://github.com/abedurftig/micronaut-data-id-example/blob/master/src/test/kotlin/github/abedurftig/MicronautDataIdExampleTest.kt) file.
 
 - Immutable Kotlin data class annotated with `MappedEntity` with `id` generated by a DB sequence
-- Abstract database test class which configures the Testcontainer
+- For testcontainer configuration see application-test.yml