Add wake_word integration docs (#28310)

Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>

source/_integrations/wake_word.markdown

@@ -0,0 +1,20 @@
+---
+title: Wake-word-detection
+description: Detect a wake word in streaming audio.
+ha_category:
+  - Voice
+ha_release: '2023.9'
+ha_codeowners:
+  - '@balloob'
+  - '@synesthesiam'
+ha_domain: wake_word
+ha_integration_type: entity
+---
+
+A wake-word-detection entity allows other integrations or applications to detect wake words in streaming audio.
+
+The wake-word-detection entities cannot be implemented manually, but can be provided by integrations such as [Wyoming](/integrations/wyoming). The API in [Assist Pipelines](https://developers.home-assistant.io/docs/voice/pipelines/) enables wake-word-detection as part of [Assist](/voice_control/).
+
+
+
+{% include integrations/building_block_integration.md %}

source/_integrations/wyoming.markdown

@@ -13,12 +13,14 @@ ha_integration_type: integration
 ha_platforms:
   - stt
   - tts
+  - wake_word
 ha_config_flow: true
 ---
 
-The Wyoming integration connects external voice services to Home Assistant using a [small protocol](https://github.com/rhasspy/rhasspy3/blob/master/docs/wyoming.md). This enables [Assist](/voice_control/) to use a variety of local [speech-to-text](/integrations/stt/) and [text-to-speech](/integrations/tts/) systems, such as:
+The Wyoming integration connects external voice services to Home Assistant using a [small protocol](https://github.com/rhasspy/rhasspy3/blob/master/docs/wyoming.md). This enables [Assist](/voice_control/) to use a variety of local [speech-to-text](/integrations/stt/), [text-to-speech](/integrations/tts/), and [wake-word-detection](/integrations/wake_word/) systems, such as:
 
 - Whisper {% my supervisor_addon badge addon="core_whisper" %}
 - Piper {% my supervisor_addon badge addon="core_piper" %}
+- openWakeWord {% my supervisor_addon badge addon="core_openwakeword" %}
 
 {% include integrations/config_flow.md %}