Update readme (#6)

Author: alessio-perugini

README.md

@@ -1 +1,66 @@
-# nina-fwuploader-plugin
+# nina-fwuploader-plugin
+
+[![Check Go status](https://github.com/arduino/nina-fwuploader-plugin/actions/workflows/check-go-task.yml/badge.svg)](https://github.com/arduino/nina-fwuploader-plugin/actions/workflows/check-go-task.yml)
+
+The `nina-fwuploader-plugin` is a core component of the [arduino-fwuploader](https://github.com/arduino/arduino-fwuploader). The purpose of this plugin is to abstract all the
+business logic needed to update firmware and certificates for the nina family boards:
+- [MKR WiFi 1010](https://docs.arduino.cc/hardware/mkr-wifi-1010)
+- [Nano 33 IoT](https://docs.arduino.cc/hardware/nano-33-iot)
+- [UNO WiFi Rev2](https://docs.arduino.cc/hardware/uno-wifi-rev2)
+- [Nano RP2040 Connect](https://docs.arduino.cc/hardware/nano-rp2040-connect)
+
+## How to contribute
+
+Contributions are welcome!
+
+:sparkles: Thanks to all our [contributors](https://github.com/arduino/nina-fwuploader-plugin/graphs/contributors)! :sparkles:
+
+### Requirements
+
+1. [Go](https://go.dev/) version 1.20 or later
+1. [Task](https://taskfile.dev/) to help you run the most common tasks from the command line
+1. One of the nina family supported boards.
+
+## Development
+
+When running the plugin inside the fwuploader, the required tools are downloaded by the fwuploader. If you run only the plugin, you must provide them by hand.
+Therefore be sure to place the `rp2040tools`, `avrdude`, and `bossac` binaries in the correct folders like the following:
+
+```bash
+.
+├── bossac
+│   └── 1.7.0-arduino3
+│       └── bossac
+├── avrdude
+│   └── 6.3.0-arduino17
+│       └── bin
+│           └── avrdude
+├── rp2040tools
+│   └── 1.0.6
+│       └── rp2040load
+└── nina-fwuploader-plugin_linux_amd64
+    └── bin
+        └── nina-fwuploader-plugin
+```
+
+**Commands**
+
+- `nina-fwuploader-plugin cert flash -p /dev/ttyACM0 ~/Documents/certificate.pem`
+- `nina-fwuploader-plugin firmware get-version -p /dev/ttyACM0`
+- `nina-fwuploader-plugin firmware flash -p /dev/ttyACM0 ~/Documents/fw0.2.0.bin`
+
+## Security
+
+If you think you found a vulnerability or other security-related bug in the nina-fwuploader-plugin, please read our [security
+policy] and report the bug to our Security Team 🛡️ Thank you!
+
+e-mail contact: [email protected]
+
+## License
+
+nina-fwuploader-plugin is licensed under the [AGPL 3.0](LICENSE.txt) license.
+
+You can be released from the requirements of the above license by purchasing a commercial license. Buying such a license
+is mandatory if you want to modify or otherwise use the software for commercial activities involving the Arduino
+software without disclosing the source code of your own applications. To purchase a commercial license, send an email to
+[email protected]