Add elevenlabs integration docs

source/_integrations/elevenlabs.markdown

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+---
+title: ElevenLabs text-to-speech
+description: Instructions on how to setup ElevenLabs text-to-speech with Home Assistant.
+ha_category:
+  - Text-to-speech
+ha_release: 2024.8
+ha_iot_class: Cloud Push
+ha_domain: elevenlabs
+ha_platforms:
+  - tts
+ha_config_flow: true
+ha_integration_type: integration
+---
+
+The **ElevenLabs** text-to-speech {% term integrations %} adds support for [ElevenLabs](https://elevenlabs.io/) as text-to-speech to read a text with natural sounding voices.
+
+{% include integrations/config_flow.md %}
+
+For an overview of which languages can be used, check the [complete list of supported languages](https://elevenlabs.io/languages).
+
+For a description of which voices are available for use, check your VoiceLab voices.
+
+To see the available models and their benefits, check the [models documentation](https://elevenlabs.io/docs/speech-synthesis/models).
+
+## Action speak
+
+The `tts.speak` action is the modern way to use TTS. Add the `speak` action, select the entity for your ElevenLabs TTS (it's named ElevenLabs), select the media player entity or group to send the TTS audio to, and enter the message to speak.
+
+For more options about `speak`, see the Speak section on the main [TTS](/integrations/tts/#service-speak) building block page.
+
+In YAML, your action will look like this:
+
+```yaml
+action: tts.speak
+target:
+  entity_id: tts.elevenlabs
+data:
+  media_player_entity_id: media_player.giant_tv
+  message: Hello, can you hear me now?
+```
+
+For more information about using text-to-speech with Home Assistant and more details on all the options it provides, see the [TTS documentation](/integrations/tts/).