Added ROM and RomLoader.cs. Updated Form1.cs to load ROM into memory

Desktop/RomLoader.cs

@@ -0,0 +1,26 @@
+using System;
+using System.IO;
+
+namespace Desktop
+{
+    public static class RomLoader
+    {
+        public static byte[] Load(string filePath)
+        {
+            if (!File.Exists(filePath))
+            {
+                throw new FileNotFoundException($"Could not find the ROM file at: {filePath}");
+            }
+
+            byte[] romData = File.ReadAllBytes(filePath);
+
+            // The standard ZX Spectrum 48k ROM is exactly 16384 bytes (16KB)
+            if (romData.Length != 16384)
+            {
+                throw new InvalidDataException($"Invalid ROM size. Expected 16384 bytes, got {romData.Length} bytes.");
+            }
+
+            return romData;
+        }
+    }
+}