Add project files.

ClipForge/SettingsService.cs

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+using System;
+using System.IO;
+using System.Text.Json;
+
+namespace ClipForge
+{
+    public class AppSettings
+    {
+        public int ClipLengthSeconds { get; set; } = 30;
+        public int VideoQuality { get; set; } = 70;
+        public int Framerate { get; set; } = 60;
+        public string HotkeyDisplay { get; set; } = "Alt + F9";
+    }
+
+    public class SettingsService
+    {
+        private static string SettingsPath => Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
+            "ClipForge", "settings.json");
+
+        public AppSettings Settings { get; private set; } = new();
+
+        public void Load()
+        {
+            try
+            {
+                if (File.Exists(SettingsPath))
+                {
+                    var json = File.ReadAllText(SettingsPath);
+                    Settings = JsonSerializer.Deserialize<AppSettings>(json) ?? new();
+                }
+            }
+            catch
+            {
+                Settings = new AppSettings();
+            }
+        }
+
+        public void Save()
+        {
+            try
+            {
+                var dir = Path.GetDirectoryName(SettingsPath)!;
+                if (!Directory.Exists(dir))
+                    Directory.CreateDirectory(dir);
+
+                var json = JsonSerializer.Serialize(Settings,
+                    new JsonSerializerOptions { WriteIndented = true });
+                File.WriteAllText(SettingsPath, json);
+            }
+            catch { }
+        }
+    }
+}