Move solution and projects to src

src/Ryujinx.HLE/HOS/Applets/Error/ErrorCommonArg.cs

@@ -0,0 +1,12 @@
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.HLE.HOS.Applets.Error
+{
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    struct ErrorCommonArg
+    {
+        public uint Module;
+        public uint Description;
+        public uint ResultCode;
+    }
+}