Initial commit: Chrony NTP Server add-on for Home Assistant

- NTP client syncs from configurable pools and servers
- NTP server mode serves time to LAN clients
- Web UI dashboard showing sync status, sources, and clients
- Supports iburst and maxsources options

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

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+# Home Assistant Add-on Repository
+
+This repository contains Home Assistant add-ons.
+
+## Add-ons
+
+### [Chrony NTP Server](./chrony-addon)
+
+NTP server and client using Chrony for accurate time synchronization.
+
+## Installation
+
+1. In Home Assistant, navigate to **Settings** → **Add-ons** → **Add-on Store**
+2. Click the menu icon (⋮) in the top right and select **Repositories**
+3. Add this repository URL: `https://github.com/adamhf/homassistant_chrony_addon`
+4. Click **Add** → **Close**
+5. The add-on should now appear in the add-on store