Updating the README to highlight how passwords can be set, first (#41)

Author: chayim

README.md

@@ -49,3 +49,5 @@ Copy the name of the pod (E.g. redis-stack-77d596476d-6j4d2) and run the followi
 ```bash
 kubectl exec -it <POD_NAME> -- redis-cli
 ```
+
+By default redis-stack will have no password, Redis Stack supports the ability to configure multiple named users, each with their own password and access control configuration.  Refer to the [Redis Access Control List documentation](https://redis.io/docs/management/security/acl/) for more information. Alternatively the configuration file can be modified and the *requirepass* directive added. This can also be triggered via the *REDIS_ARGS* environment variable. Examples are available on the [docker image page](https://hub.docker.com/repository/docker/redis/redis-stack-server/)