Add configuration note about Docker

Add minimal documentation for common CLI utils

README.md

@@ -11,6 +11,8 @@ Configuration files can be specified via environment variables. By default,
 `XDG_CONFIG_HOME` is set to the default `~/.config`.
 More information about configuration handling can be found 
 [in the docs](https://neongeckocom.github.io/neon-docs/quick_reference/configuration/).
+> *Note:* The neon-iris Docker image uses `neon.yaml` by default because the
+> `iris` web UI is often deployed with neon-core.
 
 A default configuration might look like:
 ```yaml
@@ -37,7 +39,17 @@ may be removed and `enable_lang_api: True` added to configuration. This will use
 the reported STT/TTS supported languages in place of any `iris` configuration.
 
 ## Interfacing with a Diana installation
-The `iris` CLI includes utilities for interacting with a `Diana` backend.
+The `iris` CLI includes utilities for interacting with a `Diana` backend. Use
+`iris --help` to get a current list of available commands.
 
+### `iris start-listener`
+This will start a local wake word recognizer and use a remote Neon 
+instance connected to MQ for processing audio and providing responses.
 
+### `iris start-gradio`
+This will start a local webserver and serve a Gradio UI to interact with a Neon
+instance connected to MQ.
 
+### `iris start-client`
+This starts a CLI client for typing inputs and receiving responses from a Neon 
+instance connected via MQ.