Update README.md

localstack/README.md

@@ -5,6 +5,7 @@ Start a local Keycloak instance using Docker Compose:
 ```shell
 docker-compose up --force-recreate
 ```
+Note that you will need a local `.env` file in your localstack directory. See [.env-example](.env-example) for inspiration.
 
 Inspect your local Keycloak container:
 
@@ -41,4 +42,4 @@ docker-compose up --force-recreate
 
 * Set the `KEYCLOAK_LOG_LEVEL` environment variable in the docker-compose.yml file to `DEBUG` to get more detailed logs.
 * Scripts within in the `localstack/init-scripts` directory are run on Keycloak startup. This can be handy if e.g. you need to
-download other providers or manipulate container internal files.
+download other providers or manipulate container internal files.