feat(nfs): add initial NFS server implementation with configuration and usage instructions

nfs/README.md

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+# Home Assistant Add-on: NFS Server
+
+This add-on exposes the Home Assistant media folder via NFS.
+
+## Configuration
+
+The following configuration options are available:
+
+- `allowed_network`: The network allowed to access the NFS share (e.g., `192.168.1.0/24`). Defaults to `0.0.0.0/0` (everyone). It is highly recommended to restrict this to your local network.
+
+## How to use
+
+1.  Start the add-on.
+2.  On your client machine, mount the NFS share. The NFS share will be the IP of your Home Assistant instance, and the exported path is `/media`.
+
+    Example on a Linux client:
+    ```bash
+    mkdir /mnt/hass-media
+    mount -t nfs <home-assistant-ip>:/media /mnt/hass-media
+    ```
+
+## Notes
+
+This addon requires `host_network` and `SYS_ADMIN` privileges to run.