Add README

README.md

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+# NETGEAR Check Plugin
+
+The NETGEAR Monitoring Plugin is a lightweight Go-based command-line tool designed to collect and report hardware and network metrics from NETGEAR devices via their API.
+It provides output using go-check, allowing easy integration into Icinga 2 checks.
+> [!WARNING]
+>
+> This plugin is intended **only for use with NETGEAR AV Line devices**. Use with other devices is not supported and may produce incorrect results.
+
+### Features
+
+- Fetch and report:
+  - CPU usage  
+  - RAM usage  
+  - Fan speed  
+  - Temperature sensors  
+  - Port statistics (inbound and outbound)
+  - PoE statistics (enabled state and current power)
+- Icinga-compatible check results with perfdata  
+- Configurable output via command-line flags  
+
+## Documentation
+
+### Installation
+
+Ensure you have the recent Go version installed.
+You can build and install check-netgear as follows:
+```bash
+go install github.com/icinga/check-netgear@latest
+```
+
+## Arguments
+
+| Argument           | Description                                                          |
+|--------------------|----------------------------------------------------------------------|
+| `-u`, `--username` | **Required**. Username for API login                                 |
+| `-p`, `--password` | **Required**. Password for API login                                 |
+| `-H`, `--hostname` | **Optional**. Device hostname or IP (default: http://192.168.112.19) |
+| `--mode`           | **Optional**. Modes to display: basic, ports, poe (default: basic)   |
+| `--port`           | **Optional**. List of port numbers to check (default: 1–8)           |
+| `--nocpu`          | **Optional**. Hide CPU info                                          |
+| `--noram`          | **Optional**. Hide RAM info                                          |
+| `--notemp`         | **Optional**. Hide temperature info                                  |
+| `--nofans`         | **Optional**. Hide fans info                                         |
+| `-h`, `--help`     | **Optional**. Show help message                                      |
+
+
+## Example
+```bash
+check_netgear -u admin -p VerySecurePassword --mode basic
+[WARNING] Device Info: Uptime - 1 days, 0 hrs, 31 mins, 29 secs
+\_ [OK] CPU Usage: 7.13%
+\_ [OK] RAM Usage: 32.46%
+\_ [OK] Temperature
+    \_ [OK] sensor-System1: 44.0°C
+    \_ [OK] sensor-MAC: 47.0°C
+    \_ [OK] sensor-System2: 45.0°C
+\_ [WARNING] Fans
+    \_ [WARNING] FAN-1: 0 RPM
+|CPU=7.13;;;0;100 RAM=32.46;;;0;100 sensor-System1=44;;;0 sensor-MAC=47;;;0 sensor-System2=45;;;0 'Fans speed'=0;;;0
+```
+
+## Support
+
+For questions, suggestions, or issues, please reach out through the Icinga community channels or open an issue in the project repository.
+
+## Thanks
+
+Special thanks to the NETWAYS team for the go-check library.
+
+## Contributing
+
+Contributions are welcome!
+You can help by:
+- Submitting bug fixes
+- Testing on different NETGEAR devices
+- Improving documentation or examples
+
+## License
+
+NETGEAR Icinga Check Plugin and its documentation are licensed under the terms of the [GNU General Public License v3.0](LICENSE) (GPL-3.0).
+
+