feat: enable installation directly from GitHub via HACS

[hackmann]

By setting content_in_root, we can keep the files in the root directly. The normal HACS format is to have the integration under custom_components/<integration-name>

https://hacs.xyz/docs/publish/integration/

[gemini-code-assist]

Summary of Changes

Hello @hackmann, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the Roth Touchline integration by enabling direct installation through the Home Assistant Community Store (HACS). This is achieved by introducing the necessary HACS configuration file and updating a key dependency, which collectively simplifies the setup process for users and ensures the integration utilizes the latest compatible library version.

Highlights

• HACS Integration: A new hacs.json file has been added to enable direct installation of the Roth Touchline integration via HACS, specifying content_in_root: true to accommodate the existing file structure.
• Dependency Update: The pytouchline_extended dependency in manifest.json has been updated from version 1.0.0 to 1.0.2.

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[gemini-code-assist]

Code Review

This pull request enables direct installation from GitHub via HACS by adding a hacs.json file and updating the pytouchline_extended dependency. The changes are appropriate for the stated goal. I have one suggestion to improve the hacs.json file by specifying the minimum required Home Assistant version, which is a recommended practice for HACS integrations to help users with compatibility.