Register App service

Package.appxmanifest.xml

      <Extensions>
        <uap:Extension Category="windows.appService"
          EntryPoint="VCDService.MyVoiceCommandService">
          <uap:AppService Name="MyVoiceCommandService"/>
        </uap:Extension>
        <uap:Extension Category="windows.personalAssistantLaunch"/>
      </Extensions>