Add Anthropic integration (#33952)

* Add Anthropic integration

* Update anthropic.markdown

* Update anthropic.markdown

* Update source/_integrations/anthropic.markdown

Co-authored-by: TheJulianJES <TheJulianJES@users.noreply.github.com>

* Minor style tweaks

* Apply suggestions from code review

---------

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

source/_integrations/anthropic.markdown

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+---
+title: Anthropic Conversation
+description: Instructions on how to integrate Anthropic Claude as a conversation agent
+ha_category:
+  - Voice
+ha_release: 2024.9
+ha_iot_class: Cloud Polling
+ha_config_flow: true
+ha_codeowners:
+  - '@Shulyaka'
+ha_domain: anthropic
+ha_integration_type: service
+ha_platforms:
+  - conversation
+related:
+  - docs: /voice_control/voice_remote_expose_devices/
+    title: Exposing entities to Assist
+  - docs: /voice_control/assist_create_open_ai_personality/
+    title: Create an AI personality
+  - url: https://console.anthropic.com/settings/keys
+    title: Anthropic API key
+  - url: https://www.anthropic.com
+    title: Anthropic
+  - url: https://claude.ai
+    title: Claude
+---
+
+The **Anthropic** {% term integrations %} adds a conversation agent powered by [Anthropic](https://www.anthropic.com), such as Claude 3.5 Sonnet, in Home Assistant.
+
+Controlling Home Assistant is done by providing the AI access to the Assist API of Home Assistant. You can control what devices and entities it can access from the {% my voice_assistants title="exposed entities page" %}. The AI can provide you information about your devices and control them.
+
+Legal note: Anthropic currently limits the API usage to organizations only, more info here: [Can I use the Claude API for individual use?](https://support.anthropic.com/en/articles/8987200-can-i-use-the-claude-api-for-individual-use)
+
+This integration does not integrate with [sentence triggers](/docs/automation/trigger/#sentence-trigger).
+
+## Prerequisites
+
+- This integration requires an API key to use, [which you can generate here.](https://console.anthropic.com/settings/keys). 
+- This is a paid service, we advise you to monitor your costs in the [Anthropic portal](https://console.anthropic.com/settings/cost) closely.
+
+### Generating an API Key
+
+The Anthropic API key is used to authenticate requests to the Anthropic API. To generate an API key, take the following steps:
+
+1. Log in to the [Anthropic portal](https://console.anthropic.com) or sign up for an account.
+2. Enable billing with a valid credit card on the [plans page](https://console.anthropic.com/settings/plans).
+3. Visit the [API Keys page](https://console.anthropic.com/settings/keys) to retrieve the API key you'll use to configure the integration.
+
+{% include integrations/config_flow.md %}
+
+{% include integrations/option_flow.md %}
+{% configuration_basic %}
+Instructions:
+  description: Instructions for the AI on how it should respond to your requests. It is written using [Home Assistant Templating](/docs/configuration/templating/).
+
+Control Home Assistant:
+  description: If the model is allowed to interact with Home Assistant. It can only control or provide information about entities that are [exposed](/voice_control/voice_remote_expose_devices/) to it.
+
+Recommended settings:
+  description: If enabled, the recommended model and settings are chosen.
+
+{% endconfiguration_basic %}
+
+If you choose not to use the recommended settings, you can configure the following options:
+
+{% configuration_basic %}
+
+Model:
+  description: The model that will complete your prompt. See [models](https://docs.anthropic.com/en/docs/about-claude/models#model-names) for additional details and options.
+
+Maximum Tokens to Return in Response:
+  description: The maximum number of tokens to generate before stopping. Note that our models may stop _before_ reaching this maximum. This parameter only specifies the absolute maximum number of tokens to generate. Different models have different maximum values for this parameter. See [models](https://docs.anthropic.com/en/docs/models-overview) for details.
+
+Temperature:
+  description: Amount of randomness injected into the response. Use `temperature` closer to `0.0` for analytical / multiple choice, and closer to `1.0` for creative and generative tasks. Note that even with `temperature` of `0.0`, the results will not be fully deterministic.
+
+{% endconfiguration_basic %}