Setup project, only UI and basic code

The project setup contains README, LICENSE, the full UI and materials.
The PICO-8 side is wired up, but all the Arduino code is absent as
I need to figure out how to carve it out for the students.

Assets/Scripts/PICO8_Handler.cs

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+using System.Diagnostics;
+using System.IO;
+using JetBrains.Annotations;
+using UnityEngine;
+using UnityEngine.UIElements;
+using Debug = UnityEngine.Debug;
+
+// This class starts and monitors the PICO-8 process, updating the UI.
+public class PICO8_Handler : MonoBehaviour
+{
+    private enum PicoState
+    {
+        Inactif,
+        Actif,
+        Inaccessible
+    };
+
+    private PicoState _state = PicoState.Inactif;
+    [SerializeField] [NotNull] public string pico8ExePath;
+    private Process _pico8 = new ();
+
+    [SerializeField] private UIDocument ui;
+    private EnumField _picoState;
+    private Button _picoControlButton;
+    
+    void Start()
+    {
+        // Connect the UI
+        var uiRoot = ui.rootVisualElement;
+        _picoControlButton = uiRoot.Query<Button>("PICO-Button");
+        _picoControlButton.clickable.clicked += OnButtonClick;
+        _picoState = uiRoot.Query<EnumField>("PICO-State");
+
+        // Setup the PICO-8 process : run windowed with the cart in the temporary path.
+        _pico8.StartInfo.Arguments = "-windowed 1 -run cart.png";
+        _pico8.StartInfo.WorkingDirectory = Application.temporaryCachePath;
+        _pico8.StartInfo.FileName = pico8ExePath;
+        
+        if (!File.Exists(pico8ExePath))
+        {
+            _state = PicoState.Inaccessible;
+            _picoControlButton.SetEnabled(false);
+            Debug.LogError("No PICO-8 executable provided !");
+        }
+
+        _picoState.value = _state;
+    }
+
+    void Update()
+    {
+        if (_state == PicoState.Inaccessible)
+            return;
+
+        // Check if the user has exited the PICO-8 manually
+        if (_state == PicoState.Actif && _pico8.HasExited)
+        {
+            _state = PicoState.Inactif;
+            _picoControlButton.text = "Lancer";
+        }
+
+        _picoState.value = _state;
+    }
+
+    private void OnDestroy()
+    {
+        if (_state == PicoState.Actif)
+        {
+            _pico8.Kill();
+            _pico8.WaitForExit();
+        }
+        _picoControlButton.clickable.clicked -= OnButtonClick;
+    }
+
+    private void OnButtonClick()
+    {
+        if (_state == PicoState.Inactif)
+        {
+            _pico8.Start();
+            _state = PicoState.Actif;
+            _picoControlButton.text = "Arrêter";
+        }
+        else if (_state == PicoState.Actif)
+        {
+            _pico8.Kill();
+            _pico8.WaitForExit();
+            _state = PicoState.Inactif;
+            _picoControlButton.text = "Lancer";
+        }
+    }
+}

Assets/Scripts/PICO8_Handler.cs.meta

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