Re-add NVDEC project (not integrated)

Ryujinx.Graphics.Nvdec/VDec/DecoderHelper.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace Ryujinx.Graphics.VDec
+{
+    static class DecoderHelper
+    {
+        public static byte[] Combine(byte[] arr0, byte[] arr1)
+        {
+            byte[] output = new byte[arr0.Length + arr1.Length];
+
+            Buffer.BlockCopy(arr0, 0, output, 0, arr0.Length);
+            Buffer.BlockCopy(arr1, 0, output, arr0.Length, arr1.Length);
+
+            return output;
+        }
+    }
+}