Add photobooth connect codes and uploader scaffold

clients/photobooth-uploader/PhotoboothUploader/Services/SettingsStore.cs

@@ -0,0 +1,43 @@
+using System.Text.Json;
+using PhotoboothUploader.Models;
+
+namespace PhotoboothUploader.Services;
+
+public sealed class SettingsStore
+{
+    private readonly JsonSerializerOptions _options = new()
+    {
+        PropertyNameCaseInsensitive = true,
+        WriteIndented = true,
+    };
+
+    public string SettingsPath { get; }
+
+    public SettingsStore()
+    {
+        var basePath = Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+            "Fotospiel",
+            "PhotoboothUploader");
+
+        Directory.CreateDirectory(basePath);
+        SettingsPath = Path.Combine(basePath, "settings.json");
+    }
+
+    public PhotoboothSettings Load()
+    {
+        if (!File.Exists(SettingsPath))
+        {
+            return new PhotoboothSettings();
+        }
+
+        var json = File.ReadAllText(SettingsPath);
+        return JsonSerializer.Deserialize<PhotoboothSettings>(json, _options) ?? new PhotoboothSettings();
+    }
+
+    public void Save(PhotoboothSettings settings)
+    {
+        var json = JsonSerializer.Serialize(settings, _options);
+        File.WriteAllText(SettingsPath, json);
+    }
+}