GTE: Stub and register read/write function

src/pse/pse.vcxproj.filters

@@ -12,6 +12,7 @@
     <ClCompile Include="host_interface.cpp" />
     <ClCompile Include="interrupt_controller.cpp" />
     <ClCompile Include="cdrom.cpp" />
+    <ClCompile Include="gte.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="types.h" />
@@ -28,6 +29,8 @@
     <ClInclude Include="host_interface.h" />
     <ClInclude Include="interrupt_controller.h" />
     <ClInclude Include="cdrom.h" />
+    <ClInclude Include="gte.h" />
+    <ClInclude Include="gte_types.h" />
   </ItemGroup>
   <ItemGroup>
     <None Include="cpu_core.inl" />