Add Home Assistant interaction example

[DL6ER]

What does this implement/fix?

Add example on how to use Home Assistant to control Pi-hole enable and disable through automation

Context: https://discourse.pi-hole.net/t/pi-hole-automation-in-homeassistant/74545

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Related issue or feature (if applicable): N/A

Pull request in docs with documentation (if applicable): N/A

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By submitting this pull request, I confirm the following:

1. I have read and understood the contributors guide, as well as this entire template. I understand which branch to base my commits and Pull Requests against.
2. I have commented my proposed changes within the code.
3. I am willing to help maintain this change if there are issues with it later.
4. It is compatible with the EUPL 1.2 license
5. I have squashed any insignificant commits. (git rebase)

Checklist:

• The code change is tested and works locally.
• I based my code and PRs against the repositories developmental branch.
• I signed off all commits. Pi-hole enforces the DCO for all contributions
• I signed all my commits. Pi-hole requires signatures to verify authorship
• I have read the above and my PR is ready for review.

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 27.7%, saving 19.15 KB.

Filename	Before	After	Improvement	Visual comparison
docs/images/home-assistant/automation.png	54.63 KB	39.39 KB	-27.9%	View diff
docs/images/home-assistant/boolean.png	14.41 KB	10.50 KB	-27.1%	View diff

81 images did not require optimisation.

Update required: Update image-actions configuration to the latest version before 1/1/21. See README for instructions.

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[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-automation-in-homeassistant/74545/5

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