Rename Ryujinx.Core to Ryujinx.HLE and add a separate project for a future LLE implementation

Ryujinx.HLE/OsHle/Services/Nfp/IUserManager.cs

@@ -0,0 +1,27 @@
+using Ryujinx.HLE.OsHle.Ipc;
+using System.Collections.Generic;
+
+namespace Ryujinx.HLE.OsHle.Services.Nfp
+{
+    class IUserManager : IpcService
+    {
+        private Dictionary<int, ServiceProcessRequest> m_Commands;
+
+        public override IReadOnlyDictionary<int, ServiceProcessRequest> Commands => m_Commands;
+
+        public IUserManager()
+        {
+            m_Commands = new Dictionary<int, ServiceProcessRequest>()
+            {
+                { 0, GetUserInterface }
+            };
+        }
+
+        public long GetUserInterface(ServiceCtx Context)
+        {
+            MakeObject(Context, new IUser());
+
+            return 0;
+        }
+    }
+}