Move solution and projects to src

src/Ryujinx.HLE/HOS/Services/BluetoothManager/IBtmUser.cs

@@ -0,0 +1,19 @@
+using Ryujinx.HLE.HOS.Services.BluetoothManager.BtmUser;
+
+namespace Ryujinx.HLE.HOS.Services.BluetoothManager
+{
+    [Service("btm:u")] // 5.0.0+
+    class IBtmUser : IpcService
+    {
+        public IBtmUser(ServiceCtx context) { }
+
+        [CommandCmif(0)] // 5.0.0+
+        // GetCore() -> object<nn::btm::IBtmUserCore>
+        public ResultCode GetCore(ServiceCtx context)
+        {
+            MakeObject(context, new IBtmUserCore());
+
+            return ResultCode.Success;
+        }
+    }
+}