Add AGPLv3 license, README, and update license references

README.md

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+# Family Navigator Graph
+
+A sidebar module for [webtrees](https://webtrees.net) that replaces the default Family Navigator with an interactive, graphical view of an individual's immediate family.
+
+Instead of a plain text list, this module renders a compact graph showing parents, siblings, spouses, and children at a glance — making it easier to understand relationships and quickly navigate between people.
+
+## Requirements
+
+- PHP >= 8.2
+- webtrees 2.2.x
+
+## Installation
+
+1. Download or clone this repository into your webtrees `modules_v4/` directory:
+   ```
+   modules_v4/webtrees-family-navigator-graph/
+   ```
+2. Go to the webtrees control panel and enable the **Family Navigator Graph** sidebar module.
+
+## License
+
+This project is licensed under the [GNU Affero General Public License v3.0](LICENSE).